v3.26.1
Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income $ 82,900 $ 70,279 $ 167,943 $ 144,509
Less: Net income attributable to noncontrolling interests (9,103) (4,119) (20,739) (8,665)
Net income attributable to HCI 73,797 66,160 147,204 135,844
Less: Income attributable to participating securities (2,925) (2,616) (6,186) (5,691)
Basic Earnings Per Share:        
Income attributable to common stockholders $ 70,872 $ 63,544 $ 141,018 $ 130,153
Income attributable to common stockholders, Shares (Denominator) 12,269,000 [1] 11,400,000 [1] 12,379,000 [2] 10,846,000 [2]
Basic earnings per share $ 5.78 $ 5.57 $ 11.39 $ 12
Diluted Earnings Per Share:        
Net impact from reallocation of undistributed earnings to participating securities $ 65 $ 0 $ 143 $ 0
Diluted Earnings Per Share:        
Income attributable to common stockholders $ 70,937 $ 66,714 $ 141,161 $ 135,653
Income attributable to common stockholders (Denominator) 12,658,000 [1] 12,883,000 [1] 12,776,000 [2] 12,837,000 [2]
Diluted earnings per share $ 5.6 $ 5.18 $ 11.05 $ 10.57
Warrant [Member]        
Diluted Earnings Per Share:        
Dilutive Securities, Shares (Denominator) 7,000 [1] 7,000 [1] 7,000 [2] 7,000 [2]
Convertible Senior Notes [Member]        
Diluted Earnings Per Share:        
Interest on Convertible Debt, Net of Tax   $ 3,170   $ 5,500
Dilutive Securities, Shares (Denominator)   1,084 [1]   1,611 [2]
Employee Stock Option        
Diluted Earnings Per Share:        
Dilutive Securities, Shares (Denominator) 382,000 [1] 392,000 [1] 390,000 [2] 373,000 [2]
[1] Shares in thousands.
[2] Shares in thousands.