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Fair Value Measurement - Summary of Fair Values and Gross Unrealized Losses of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis $ 3,395 $ 16,364
Less than 12 months, Gross Unrealized Losses (26) (82)
12 months or longer, Recorded Basis 208,920 224,185
12 months or longer, Gross Unrealized Losses (19,846) (26,566)
Total, Recorded Basis 212,315 240,549
Total, Gross Unrealized Losses (19,872) (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 55,334 60,065
12 months or longer, Gross Unrealized Losses (5,014) (6,409)
Total, Recorded Basis 55,334 60,085
Total, Gross Unrealized Losses (5,014) (6,409)
Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 3,395 16,344
Less than 12 months, Gross Unrealized Losses (26) (82)
12 months or longer, Recorded Basis 153,586 164,120
12 months or longer, Gross Unrealized Losses (14,832) (20,157)
Total, Recorded Basis 156,981 180,464
Total, Gross Unrealized Losses (14,858) (20,239)
Corporate Bonds [Member] | 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 26,028 25,377
12 months or longer, Gross Unrealized Losses (1,660) (2,365)
Total, Recorded Basis 26,028 25,397
Total, Gross Unrealized Losses (1,660) (2,365)
Corporate Bonds [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 397 11,142
Less than 12 months, Gross Unrealized Losses (1) (15)
12 months or longer, Recorded Basis 72,903 71,716
12 months or longer, Gross Unrealized Losses (5,122) (7,287)
Total, Recorded Basis 73,300 82,858
Total, Gross Unrealized Losses (5,123) (7,302)
U.S. Government Agency Securities [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 5,507 12,531
12 months or longer, Gross Unrealized Losses (455) (203)
Total, Recorded Basis 5,507 12,531
Total, Gross Unrealized Losses (455) (203)
U.S. Government Agency Securities [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 5,262 15,871
12 months or longer, Gross Unrealized Losses (89) (914)
Total, Recorded Basis 5,262 15,871
Total, Gross Unrealized Losses (89) (914)
U.S. Treasuries [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 13,411 11,320
12 months or longer, Gross Unrealized Losses (849) (1,140)
Total, Recorded Basis 13,411 11,320
Total, Gross Unrealized Losses (849) (1,140)
U.S. Treasuries [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 1,219 1,399
Less than 12 months, Gross Unrealized Losses (5) (29)
12 months or longer, Recorded Basis 46,592 46,656
12 months or longer, Gross Unrealized Losses (4,535) (6,319)
Total, Recorded Basis 47,811 48,055
Total, Gross Unrealized Losses (4,540) (6,348)
Mortgage-Backed Securities [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 9,329 9,536
12 months or longer, Gross Unrealized Losses (2,335) (2,592)
Total, Recorded Basis 9,329 9,536
Total, Gross Unrealized Losses (2,335) (2,592)
Mortgage-Backed Securities [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 1,522 3,360
Less than 12 months, Gross Unrealized Losses (17) (37)
12 months or longer, Recorded Basis 28,584 29,877
12 months or longer, Gross Unrealized Losses (4,720) (5,637)
Total, Recorded Basis 30,106 33,237
Total, Gross Unrealized Losses (4,737) (5,674)
Asset-Backed Securities [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 1,304 1,301
12 months or longer, Gross Unrealized Losses (81) (109)
Total, Recorded Basis 1,304 1,301
Total, Gross Unrealized Losses (81) (109)
Asset-Backed Securities [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 257 443
Less than 12 months, Gross Unrealized Losses (3) (1)
Total, Recorded Basis 257 443
Total, Gross Unrealized Losses $ (3) $ (1)