v3.26.3
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Revenue            
Total revenue $ 170,822,000 $ 203,457,000 $ 342,143,000 $ 401,887,000    
Operating expenses            
Total cost of sales 109,524,000 151,545,000 226,157,000 293,428,000    
Selling, general and administrative expenses 60,354,000 29,441,000 95,465,000 65,679,000    
Research and development expenses 771,000 649,000 1,185,000 1,680,000    
Restructuring and other expenses (income), net 5,004,000 1,072,000 5,004,000 4,343,000    
Total operating expenses 175,653,000 182,707,000 327,811,000 365,130,000    
Operating income (loss) (4,831,000) 20,750,000 14,332,000 36,757,000    
Foreign currency gain (loss), net (591,000) 2,948,000 (2,819,000) 6,941,000    
Other non-operating income (loss) (158,000) 334,000 (413,000) 647,000    
Interest income (expense), net (3,945,000) (9,106,000) (10,898,000) (18,285,000) $ (43,352,000) $ (37,255,000)
Income (loss) before income taxes (9,525,000) 14,926,000 202,000 26,060,000    
Income tax (expense) benefit 4,506,000 (5,158,000) (1,346,000) (10,414,000)    
Net income (loss) (5,019,000) 9,768,000 (1,144,000) 15,646,000    
Less: Net income (loss) attributable to non-controlling interests (9,995,000) 819,000 (9,568,000) 585,000    
Net income (loss) attributable to HMH Holding Inc. $ 4,976,000 $ 8,949,000 $ 8,424,000 $ 15,061,000    
Net income (loss) per share of common stock (actual)—Basic (in dollars per share) $ 0.43 $ 0.13 $ 1.44 $ 0.22    
Net income (loss) per share of Class A common stock (actual) — Diluted (in dollars per share) $ 0.42 $ 0.13 $ 1.26 $ 0.22    
Weighted-average shares of common stock for HMH and HMH B.V. outstanding—Basic (in shares) 11,662,000 69,355,000 5,863,000 69,355,000    
Weighted-average shares of common stock for HMH and HMH B.V. outstanding—Diluted (in shares) 11,971,000 69,355,000 6,688,000 69,355,000    
Related Party            
Revenue            
Total revenue $ 560,000 $ 162,000 $ 887,000 $ 252,000    
Operating expenses            
Interest income (expense), net 62,000 2,517,000 2,720,000 4,957,000    
Service            
Revenue            
Total revenue 89,072,000 92,332,000 161,081,000 175,840,000    
Operating expenses            
Total cost of sales 58,766,000 63,671,000 111,824,000 120,749,000    
Service | Nonrelated Party            
Revenue            
Total revenue 89,072,000 92,332,000 161,081,000 175,840,000    
Product            
Operating expenses            
Total cost of sales 16,527,000 53,422,000 41,894,000 100,119,000    
Product | Nonrelated Party            
Revenue            
Total revenue 20,027,000 58,812,000 52,493,000 113,470,000    
Spare Parts            
Revenue            
Total revenue 61,163,000 52,151,000 127,682,000 112,325,000    
Operating expenses            
Total cost of sales 34,231,000 34,452,000 72,439,000 72,560,000    
Spare Parts | Nonrelated Party            
Revenue            
Total revenue $ 61,163,000 $ 52,151,000 127,682,000 112,325,000    
HMH Holding BV And Subsidiaries [Member]            
Revenue            
Total revenue         821,754,000 843,363,000 [1]
Operating expenses            
Total cost of sales         576,024,000 571,173,000
Selling, general and administrative expenses         130,397,000 146,810,000
Research and development expenses         2,813,000 7,067,000
Restructuring and other expenses (income), net         4,631,000 (301,000)
Total operating expenses         713,865,000 724,749,000
Operating income (loss)         107,889,000 118,614,000
Foreign currency gain (loss), net         6,790,000 (5,293,000)
Other non-operating income (loss)         1,263,000 423,000
Interest income (expense), net         (43,352,000) (37,255)
Income (loss) before income taxes       72,590,000 72,590,000 76,489,000
Income tax (expense) benefit         (26,467,000) (24,533,000)
Net income (loss)     $ (1,144,000) $ 15,646,000 46,123,000 51,956,000
Less: Net income (loss) attributable to non-controlling interests         669,000 738,000
Net income (loss) attributable to HMH Holding Inc.         $ 45,454,000 $ 51,218,000
Net income (loss) per share of common stock (actual)—Basic (in dollars per share)         $ 227,270 $ 256,090
Net income (loss) per share of Class A common stock (actual) — Diluted (in dollars per share)         $ 227,270 $ 256,090
Weighted-average shares of common stock for HMH and HMH B.V. outstanding—Basic (in shares)         200,000 200,000
Weighted-average shares of common stock for HMH and HMH B.V. outstanding—Diluted (in shares)         200,000 200,000
HMH Holding BV And Subsidiaries [Member] | Related Party            
Revenue            
Total revenue         $ 445,000 $ 3,615,000
Operating expenses            
Interest income (expense), net         10,218,000 9,302,000
HMH Holding BV And Subsidiaries [Member] | Service            
Revenue            
Total revenue         383,385,000 366,202,000
Operating expenses            
Total cost of sales         253,541,000 223,376,000
HMH Holding BV And Subsidiaries [Member] | Service | Nonrelated Party            
Revenue            
Total revenue         383,385,000 366,202,000
HMH Holding BV And Subsidiaries [Member] | Product            
Operating expenses            
Total cost of sales         183,509,000 205,172,000
HMH Holding BV And Subsidiaries [Member] | Product | Nonrelated Party            
Revenue            
Total revenue         213,544,000 225,521,000
HMH Holding BV And Subsidiaries [Member] | Spare Parts            
Revenue            
Total revenue         224,380,000 248,025,000
Operating expenses            
Total cost of sales         138,974,000 142,625,000
HMH Holding BV And Subsidiaries [Member] | Spare Parts | Nonrelated Party            
Revenue            
Total revenue         224,380,000 $ 248,025,000
HMH Holding Inc. [Member] | Historical [Member]            
Revenue            
Total revenue         821,754,000  
Operating expenses            
Total cost of sales         576,024,000  
Selling, general and administrative expenses         130,397,000  
Research and development expenses         2,813,000  
Restructuring and other expenses (income), net         4,631,000  
Total operating expenses         713,865,000  
Operating income (loss)         107,889,000  
Foreign currency gain (loss), net         6,790,000  
Other non-operating income (loss)         1,263,000  
Interest income (expense), net         (43,352,000)  
Income (loss) before income taxes         72,590,000  
Income tax (expense) benefit         (26,467,000)  
Net income (loss)         46,123,000  
Less: Net income (loss) attributable to non-controlling interests         669,000  
Net income (loss) attributable to HMH Holding Inc.         45,454,000  
HMH Holding Inc. [Member] | Corporate Reorganizations Adjustment [Member]            
Revenue            
Total revenue         0  
Operating expenses            
Total cost of sales         0  
Selling, general and administrative expenses         0  
Research and development expenses         0  
Restructuring and other expenses (income), net         0  
Total operating expenses         0  
Operating income (loss)         0  
Foreign currency gain (loss), net         0  
Other non-operating income (loss)         0  
Interest income (expense), net         0  
Income (loss) before income taxes         0  
Income tax (expense) benefit         0  
Net income (loss)         0  
Less: Net income (loss) attributable to non-controlling interests         0  
Net income (loss) attributable to HMH Holding Inc.         0  
HMH Holding Inc. [Member] | Offering Transactions Adjustments [Member]            
Revenue            
Total revenue         0  
Operating expenses            
Total cost of sales         0  
Selling, general and administrative expenses         21,186,000  
Research and development expenses         0  
Restructuring and other expenses (income), net         0  
Total operating expenses         21,186,000  
Operating income (loss)         (21,186,000)  
Foreign currency gain (loss), net         0  
Other non-operating income (loss)         0  
Interest income (expense), net         10,218,000  
Income (loss) before income taxes         (10,968,000)  
Income tax (expense) benefit         0  
Net income (loss)         (10,968,000)  
Less: Net income (loss) attributable to non-controlling interests         26,068,000  
Net income (loss) attributable to HMH Holding Inc.         (37,036,000)  
HMH Holding Inc. [Member] | Pro Forma [Member]            
Revenue            
Total revenue         821,754,000  
Operating expenses            
Total cost of sales         576,024,000  
Selling, general and administrative expenses         151,583,000  
Research and development expenses         2,813,000  
Restructuring and other expenses (income), net         4,631,000  
Total operating expenses         735,051,000  
Operating income (loss)         86,703,000  
Foreign currency gain (loss), net         6,790,000  
Other non-operating income (loss)         1,263,000  
Interest income (expense), net         (33,134,000)  
Income (loss) before income taxes         61,622,000  
Income tax (expense) benefit         (26,467,000)  
Net income (loss)         35,155,000  
Less: Net income (loss) attributable to non-controlling interests         26,737,000  
Net income (loss) attributable to HMH Holding Inc.         $ 8,418,000  
Net income (loss) per share of common stock (actual)—Basic (in dollars per share)         $ 0.74  
Net income (loss) per share of Class A common stock (actual) — Diluted (in dollars per share)         $ 0.74  
Weighted-average shares of common stock for HMH and HMH B.V. outstanding—Basic (in shares)         11,422,504  
Weighted-average shares of common stock for HMH and HMH B.V. outstanding—Diluted (in shares)         11,422,504  
HMH Holding Inc. [Member] | Related Party | Historical [Member]            
Revenue            
Total revenue         $ 445,000  
HMH Holding Inc. [Member] | Related Party | Corporate Reorganizations Adjustment [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Related Party | Offering Transactions Adjustments [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Related Party | Pro Forma [Member]            
Revenue            
Total revenue         445,000  
HMH Holding Inc. [Member] | Service | Historical [Member]            
Operating expenses            
Total cost of sales         253,541,000  
HMH Holding Inc. [Member] | Service | Corporate Reorganizations Adjustment [Member]            
Operating expenses            
Total cost of sales         0  
HMH Holding Inc. [Member] | Service | Offering Transactions Adjustments [Member]            
Operating expenses            
Total cost of sales         0  
HMH Holding Inc. [Member] | Service | Pro Forma [Member]            
Operating expenses            
Total cost of sales         253,541,000  
HMH Holding Inc. [Member] | Service | Nonrelated Party | Historical [Member]            
Revenue            
Total revenue         383,385,000  
HMH Holding Inc. [Member] | Service | Nonrelated Party | Corporate Reorganizations Adjustment [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Service | Nonrelated Party | Offering Transactions Adjustments [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Service | Nonrelated Party | Pro Forma [Member]            
Revenue            
Total revenue         383,385,000  
HMH Holding Inc. [Member] | Product | Historical [Member]            
Operating expenses            
Total cost of sales         183,509,000  
HMH Holding Inc. [Member] | Product | Corporate Reorganizations Adjustment [Member]            
Operating expenses            
Total cost of sales         0  
HMH Holding Inc. [Member] | Product | Offering Transactions Adjustments [Member]            
Operating expenses            
Total cost of sales         0  
HMH Holding Inc. [Member] | Product | Pro Forma [Member]            
Operating expenses            
Total cost of sales         183,509,000  
HMH Holding Inc. [Member] | Product | Nonrelated Party | Historical [Member]            
Revenue            
Total revenue         213,544,000  
HMH Holding Inc. [Member] | Product | Nonrelated Party | Corporate Reorganizations Adjustment [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Product | Nonrelated Party | Offering Transactions Adjustments [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Product | Nonrelated Party | Pro Forma [Member]            
Revenue            
Total revenue         213,544,000  
HMH Holding Inc. [Member] | Spare Parts | Historical [Member]            
Operating expenses            
Total cost of sales         138,974,000  
HMH Holding Inc. [Member] | Spare Parts | Corporate Reorganizations Adjustment [Member]            
Operating expenses            
Total cost of sales         0  
HMH Holding Inc. [Member] | Spare Parts | Offering Transactions Adjustments [Member]            
Operating expenses            
Total cost of sales         0  
HMH Holding Inc. [Member] | Spare Parts | Pro Forma [Member]            
Operating expenses            
Total cost of sales         138,974,000  
HMH Holding Inc. [Member] | Spare Parts | Nonrelated Party | Historical [Member]            
Revenue            
Total revenue         224,380,000  
HMH Holding Inc. [Member] | Spare Parts | Nonrelated Party | Corporate Reorganizations Adjustment [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Spare Parts | Nonrelated Party | Offering Transactions Adjustments [Member]            
Revenue            
Total revenue         0  
HMH Holding Inc. [Member] | Spare Parts | Nonrelated Party | Pro Forma [Member]            
Revenue            
Total revenue         $ 224,380,000  
[1] As the CODM does not regularly review intersegment revenue, it is excluded from the determination of total segment operating income. The CODM uses revenue from external customers to assess performance and allocate resources.