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Fair Value Measurement - Summary of Fair Values and Gross Unrealized Losses of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis $ 16,364 $ 6,554
Less than 12 months, Gross Unrealized Losses (82) (199)
12 months or longer, Recorded Basis 224,185 239,313
12 months or longer, Gross Unrealized Losses (26,566) (28,603)
Total, Recorded Basis 240,549 245,867
Total, Gross Unrealized Losses (26,648) (28,802)
Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 20 562
Less than 12 months, Gross Unrealized Losses   (20)
12 months or longer, Recorded Basis 60,065 72,068
12 months or longer, Gross Unrealized Losses (6,409) (7,455)
Total, Recorded Basis 60,085 72,630
Total, Gross Unrealized Losses (6,409) (7,475)
Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 16,344 5,992
Less than 12 months, Gross Unrealized Losses (82) (179)
12 months or longer, Recorded Basis 164,120 167,245
12 months or longer, Gross Unrealized Losses (20,157) (21,148)
Total, Recorded Basis 180,464 173,237
Total, Gross Unrealized Losses (20,239) (21,327)
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 25,377 31,122
12 months or longer, Gross Unrealized Losses (2,365) (3,161)
Total, Recorded Basis 25,397 31,122
Total, Gross Unrealized Losses (2,365) (3,161)
Corporate Bonds [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 11,142 176
Less than 12 months, Gross Unrealized Losses (15) (1)
12 months or longer, Recorded Basis 71,716 72,439
12 months or longer, Gross Unrealized Losses (7,287) (8,472)
Total, Recorded Basis 82,858 72,615
Total, Gross Unrealized Losses (7,302) (8,473)
U.S. Government Agency Securities [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   562
Less than 12 months, Gross Unrealized Losses   (20)
12 months or longer, Recorded Basis 12,531 11,859
12 months or longer, Gross Unrealized Losses (203) (388)
Total, Recorded Basis 12,531 12,421
Total, Gross Unrealized Losses (203) (408)
U.S. Government Agency Securities [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis   3,287
Less than 12 months, Gross Unrealized Losses   (171)
12 months or longer, Recorded Basis 15,871 12,377
12 months or longer, Gross Unrealized Losses (914) (1,028)
Total, Recorded Basis 15,871 15,664
Total, Gross Unrealized Losses (914) (1,199)
U.S. Treasuries [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 11,320 11,195
12 months or longer, Gross Unrealized Losses (1,140) (1,253)
Total, Recorded Basis 11,320 11,195
Total, Gross Unrealized Losses (1,140) (1,253)
U.S. Treasuries [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 1,399 994
Less than 12 months, Gross Unrealized Losses (29) (1)
12 months or longer, Recorded Basis 46,656 47,046
12 months or longer, Gross Unrealized Losses (6,319) (6,435)
Total, Recorded Basis 48,055 48,040
Total, Gross Unrealized Losses (6,348) (6,436)
Mortgage-Backed Securities [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 9,536 10,629
12 months or longer, Gross Unrealized Losses (2,592) (2,454)
Total, Recorded Basis 9,536 10,629
Total, Gross Unrealized Losses (2,592) (2,454)
Mortgage-Backed Securities [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 3,360 1,235
Less than 12 months, Gross Unrealized Losses (37) (5)
12 months or longer, Recorded Basis 29,877 35,383
12 months or longer, Gross Unrealized Losses (5,637) (5,213)
Total, Recorded Basis 33,237 36,618
Total, Gross Unrealized Losses (5,674) (5,218)
Asset-Backed Securities [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis 1,301 5,268
12 months or longer, Gross Unrealized Losses (109) (191)
Total, Recorded Basis 1,301 5,268
Total, Gross Unrealized Losses (109) (191)
Asset-Backed Securities [Member] | Restricted Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
Less than 12 months, Recorded Basis 443 300
Less than 12 months, Gross Unrealized Losses (1) (1)
Total, Recorded Basis 443 300
Total, Gross Unrealized Losses $ (1) (1)
Emerging Markets [Member] | Investments [Member]    
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]    
12 months or longer, Recorded Basis   1,995
12 months or longer, Gross Unrealized Losses   (8)
Total, Recorded Basis   1,995
Total, Gross Unrealized Losses   $ (8)