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Fair Value Measurement - Summary of Fair Values and Gross Unrealized Losses of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   $ 16,364
Less than 12 months, Gross Unrealized Losses   (82)
12 months or longer, Recorded Basis $ 210,404 224,185
12 months or longer, Gross Unrealized Losses (17,606) (26,566)
Total, Recorded Basis 210,404 240,549
Total, Gross Unrealized Losses (17,606) (26,648)
Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   20
12 months or longer, Recorded Basis 55,642 60,065
12 months or longer, Gross Unrealized Losses (4,406) (6,409)
Total, Recorded Basis 55,642 60,085
Total, Gross Unrealized Losses (4,406) (6,409)
Investments [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   20
12 months or longer, Recorded Basis 26,258 25,377
12 months or longer, Gross Unrealized Losses (1,402) (2,365)
Total, Recorded Basis 26,258 25,397
Total, Gross Unrealized Losses (1,402) (2,365)
Investments [Member] | U.S. Treasuries [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 13,516 11,320
12 months or longer, Gross Unrealized Losses (744) (1,140)
Total, Recorded Basis 13,516 11,320
Total, Gross Unrealized Losses (744) (1,140)
Investments [Member] | Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 9,294 9,536
12 months or longer, Gross Unrealized Losses (2,132) (2,592)
Total, Recorded Basis 9,294 9,536
Total, Gross Unrealized Losses (2,132) (2,592)
Investments [Member] | U.S. Government Agency Securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 5,266 12,531
12 months or longer, Gross Unrealized Losses (64) (203)
Total, Recorded Basis 5,266 12,531
Total, Gross Unrealized Losses (64) (203)
Investments [Member] | Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 1,308 1,301
12 months or longer, Gross Unrealized Losses (64) (109)
Total, Recorded Basis 1,308 1,301
Total, Gross Unrealized Losses (64) (109)
Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   16,344
Less than 12 months, Gross Unrealized Losses   (82)
12 months or longer, Recorded Basis 154,762 164,120
12 months or longer, Gross Unrealized Losses (13,200) (20,157)
Total, Recorded Basis 154,762 180,464
Total, Gross Unrealized Losses (13,200) (20,239)
Restricted Investments [Member] | Corporate Bonds [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   11,142
Less than 12 months, Gross Unrealized Losses   (15)
12 months or longer, Recorded Basis 73,432 71,716
12 months or longer, Gross Unrealized Losses (4,403) (7,287)
Total, Recorded Basis 73,432 82,858
Total, Gross Unrealized Losses (4,403) (7,302)
Restricted Investments [Member] | U.S. Treasuries [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   1,399
Less than 12 months, Gross Unrealized Losses   (29)
12 months or longer, Recorded Basis 47,689 46,656
12 months or longer, Gross Unrealized Losses (4,144) (6,319)
Total, Recorded Basis 47,689 48,055
Total, Gross Unrealized Losses (4,144) (6,348)
Restricted Investments [Member] | Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   3,360
Less than 12 months, Gross Unrealized Losses   (37)
12 months or longer, Recorded Basis 28,059 29,877
12 months or longer, Gross Unrealized Losses (4,280) (5,637)
Total, Recorded Basis 28,059 33,237
Total, Gross Unrealized Losses (4,280) (5,674)
Restricted Investments [Member] | U.S. Government Agency Securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 5,582 15,871
12 months or longer, Gross Unrealized Losses (373) (914)
Total, Recorded Basis 5,582 15,871
Total, Gross Unrealized Losses $ (373) (914)
Restricted Investments [Member] | Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   443
Less than 12 months, Gross Unrealized Losses   (1)
Total, Recorded Basis   443
Total, Gross Unrealized Losses   $ (1)