CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) |
Total |
Additional paid-in capital |
Common stock held in treasury |
Accumulated other comprehensive income (loss) |
Retained earnings (loss) |
Non-controlling interest |
Class A common stock |
Class A common stock
Common Stock
|
Class B common stock |
Class B common stock
Common Stock
|
HMH Holding BV And Subsidiaries [Member] |
HMH Holding BV And Subsidiaries [Member]
Common Stock
|
HMH Holding BV And Subsidiaries [Member]
Additional paid-in capital
|
HMH Holding BV And Subsidiaries [Member]
Hedging Reserve [Member]
|
HMH Holding BV And Subsidiaries [Member]
Pension Remeasurement Reserve [Member]
|
HMH Holding BV And Subsidiaries [Member]
Currency Translation Reserve [Member]
|
HMH Holding BV And Subsidiaries [Member]
Accumulated other comprehensive income (loss)
|
HMH Holding BV And Subsidiaries [Member]
Retained earnings (loss)
|
HMH Holding BV And Subsidiaries [Member]
Non-controlling interest
|
HMH Holding BV And Subsidiaries [Member]
Class A common stock
|
HMH Holding BV And Subsidiaries [Member]
Class B common stock
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Beginning balance, shares outstanding (in shares) at Dec. 31, 2023 | 200,000 | ||||||||||||||||||||
| Beginning balance at Dec. 31, 2023 | $ 593,131,000 | $ 0 | $ 601,539,000 | $ 1,098,000 | $ 1,220,000 | $ 2,003,000 | $ 4,321,000 | $ (12,729,000) | $ 0 | ||||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Other comprehensive income (loss) | (23,074,000) | (3,348,000) | 842,000 | (20,568,000) | (23,074,000) | ||||||||||||||||
| Sale ownership interest in Hydril Arabia | 9,324,000 | 8,892,000 | 432,000 | ||||||||||||||||||
| Net income (loss) | $ 51,956,000 | 51,218,000 | 738,000 | ||||||||||||||||||
| Ending balance, shares outstanding (in shares) at Dec. 31, 2024 | 0 | 0 | 200 | 200,000 | 100 | ||||||||||||||||
| Ending balance at Dec. 31, 2024 | $ 631,337,000 | $ 610,431,000 | $ 0 | $ (18,753,000) | $ 38,489,000 | $ 1,170,000 | $ 0 | $ 0 | $ 631,337,000 | $ 0 | 610,431,000 | (2,250,000) | 2,062,000 | (18,565,000) | (18,753,000) | 38,489,000 | 1,170,000 | ||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Other comprehensive income (loss) | 22,364,000 | 22,364,000 | |||||||||||||||||||
| Net income (loss) | 15,646,000 | 15,061,000 | 585,000 | $ 15,646,000 | |||||||||||||||||
| Ending balance, shares outstanding (in shares) at Jun. 30, 2025 | 0 | 0 | |||||||||||||||||||
| Ending balance at Jun. 30, 2025 | 669,347,000 | 610,431,000 | 0 | 3,611,000 | 53,550,000 | 1,755,000 | $ 0 | $ 0 | |||||||||||||
| Beginning balance, shares outstanding (in shares) at Dec. 31, 2024 | 0 | 0 | 200 | 200,000 | 100 | ||||||||||||||||
| Beginning balance at Dec. 31, 2024 | 631,337,000 | 610,431,000 | 0 | (18,753,000) | 38,489,000 | 1,170,000 | $ 0 | $ 0 | $ 631,337,000 | $ 0 | 610,431,000 | (2,250,000) | 2,062,000 | (18,565,000) | (18,753,000) | 38,489,000 | 1,170,000 | ||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Other comprehensive income (loss) | 22,992,000 | 2,715,000 | 629,000 | 19,648,000 | 22,992,000 | ||||||||||||||||
| Net income (loss) | $ 46,123,000 | 45,454,000 | 669,000 | ||||||||||||||||||
| Ending balance, shares outstanding (in shares) at Dec. 31, 2025 | 0 | 0 | 200 | 200,000 | 100 | ||||||||||||||||
| Ending balance at Dec. 31, 2025 | 700,452,000 | 610,431,000 | 4,239,000 | 83,943,000 | 1,839,000 | $ 0 | $ 0 | $ 700,452,000 | $ 0 | 610,431,000 | 465,000 | 2,691,000 | 1,083,000 | 4,239,000 | 83,943,000 | 1,839,000 | |||||
| Beginning balance, shares outstanding (in shares) at Mar. 31, 2025 | 0 | 0 | |||||||||||||||||||
| Beginning balance at Mar. 31, 2025 | 650,794,000 | 610,431,000 | 0 | (5,174,000) | 44,601,000 | 936,000 | $ 0 | $ 0 | |||||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Other comprehensive income (loss) | 8,785,000 | 8,785,000 | |||||||||||||||||||
| Net income (loss) | 9,768,000 | 8,949,000 | 819,000 | ||||||||||||||||||
| Ending balance, shares outstanding (in shares) at Jun. 30, 2025 | 0 | 0 | |||||||||||||||||||
| Ending balance at Jun. 30, 2025 | 669,347,000 | 610,431,000 | 0 | 3,611,000 | 53,550,000 | 1,755,000 | $ 0 | $ 0 | |||||||||||||
| Beginning balance, shares outstanding (in shares) at Dec. 31, 2025 | 0 | 0 | 200 | 200,000 | 100 | ||||||||||||||||
| Beginning balance at Dec. 31, 2025 | 700,452,000 | 610,431,000 | 4,239,000 | 83,943,000 | 1,839,000 | $ 0 | $ 0 | $ 700,452,000 | $ 0 | $ 610,431,000 | $ 465,000 | $ 2,691,000 | $ 1,083,000 | $ 4,239,000 | $ 83,943,000 | $ 1,839,000 | |||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Net income Prior To The Corporate Reorganization Transactions | 3,875,000 | 3,448,000 | 427,000 | ||||||||||||||||||
| Other comprehensive income (loss) | 3,619,000 | ||||||||||||||||||||
| Other comprehensive income prior to the Corporate Reorganization Transactions | 5,600,000 | 5,600,000 | |||||||||||||||||||
| Issuance of common stock in initial public offering, net of offering costs (in shares) | 11,206 | 32,578 | |||||||||||||||||||
| Issuance of common stock in initial public offering, net of offering costs | 210,670,000 | 210,232,000 | $ 112,000 | $ 326,000 | |||||||||||||||||
| Redemption under exchange agreement with Principal Stockholders (in shares) | (686) | ||||||||||||||||||||
| Redemption under exchange agreement with Principal Stockholders | (12,894,000) | 631,000 | (13,518,000) | $ (7,000) | |||||||||||||||||
| Purchase of HMH B.V. voting shares from Principal Stockholders | (39,480,000) | (39,480,000) | |||||||||||||||||||
| Effect of the Corporate Reorganization Transactions | 0 | (570,015,000) | (7,296,000) | (64,801,000) | 642,112,000 | ||||||||||||||||
| IPO related costs | (26,189,000) | (26,189,000) | |||||||||||||||||||
| TRA liability and related deferred tax impact from the Corporate Reorganization Transactions | (6,522,000) | (6,522,000) | |||||||||||||||||||
| Net income (loss) subsequent to the Corporate Reorganization Transactions | (5,019,000) | 4,976,000 | (9,995,000) | ||||||||||||||||||
| Net income (loss) | (1,144,000) | $ (1,144,000) | |||||||||||||||||||
| Share-based compensation (in shares) | 837 | ||||||||||||||||||||
| Share-based compensation | 22,775,000 | 6,045,000 | 16,722,000 | $ 8,000 | |||||||||||||||||
| Purchase of treasury stock | (4,888,000) | (4,888,000) | |||||||||||||||||||
| Other Comprehensive Income Subsequent To The Corporate Reorganization Transactions | (1,981) | (532) | (1,449) | ||||||||||||||||||
| Ending balance, shares outstanding (in shares) at Jun. 30, 2026 | 12,043 | 31,891,652 | 31,892 | 63,783,304 | 12,042,625 | 31,891,652 | |||||||||||||||
| Ending balance at Jun. 30, 2026 | 846,399,000 | 185,133,000 | (4,888,000) | 2,011,000 | 27,566,000 | 636,138,000 | $ 120,000 | $ 319,000 | |||||||||||||
| Beginning balance, shares outstanding (in shares) at Mar. 31, 2026 | 0 | 0 | |||||||||||||||||||
| Beginning balance at Mar. 31, 2026 | 709,927,000 | 610,431,000 | 0 | 9,839,000 | 87,391,000 | 2,266,000 | $ 0 | $ 0 | |||||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Other comprehensive income (loss) | (1,981,000) | (532,000) | (1,449,000) | ||||||||||||||||||
| Issuance of common stock in initial public offering, net of offering costs (in shares) | 11,206 | 32,578 | |||||||||||||||||||
| Issuance of common stock in initial public offering, net of offering costs | 210,670,000 | 210,232,000 | $ 112,000 | $ 326,000 | |||||||||||||||||
| Redemption under exchange agreement with Principal Stockholders (in shares) | (686) | ||||||||||||||||||||
| Redemption under exchange agreement with Principal Stockholders | (12,894,000) | 631,000 | (13,518,000) | $ (7,000) | |||||||||||||||||
| Purchase of HMH B.V. voting shares from Principal Stockholders | (39,480,000) | (39,480,000) | |||||||||||||||||||
| Effect of the Corporate Reorganization Transactions | 0 | (570,015,000) | (7,296,000) | (64,801,000) | 642,112,000 | ||||||||||||||||
| IPO related costs | (26,189,000) | (26,189,000) | |||||||||||||||||||
| TRA liability and related deferred tax impact from the Corporate Reorganization Transactions | (6,522,000) | (6,522,000) | |||||||||||||||||||
| Net income (loss) | (5,019,000) | 4,976,000 | (9,995,000) | ||||||||||||||||||
| Share-based compensation (in shares) | 837 | ||||||||||||||||||||
| Share-based compensation | 22,775,000 | 6,045,000 | 16,722,000 | $ 8,000 | |||||||||||||||||
| Purchase of treasury stock | (4,888,000) | (4,888,000) | |||||||||||||||||||
| Ending balance, shares outstanding (in shares) at Jun. 30, 2026 | 12,043 | 31,891,652 | 31,892 | 63,783,304 | 12,042,625 | 31,891,652 | |||||||||||||||
| Ending balance at Jun. 30, 2026 | 846,399,000 | $ 185,133,000 | $ (4,888,000) | $ 2,011,000 | $ 27,566,000 | $ 636,138,000 | $ 120,000 | $ 319,000 | |||||||||||||
| Beginning balance, shares outstanding (in shares) at Apr. 01, 2026 | 100 | 100 | |||||||||||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||||||
| Redemption under exchange agreement with Principal Stockholders (in shares) | (2,100,000) | (2,100,000) | |||||||||||||||||||
| Purchase of HMH B.V. voting shares from Principal Stockholders | $ (39,500,000) | ||||||||||||||||||||
| Share-based compensation (in shares) | 836,781 |