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Fair Value Measurement - Summary of Fair Values and Gross Unrealized Losses of Available for Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | $ 44,500 | $ 16,364
Less than 12 months, Gross Unrealized Losses | (55) | (82)
12 months or longer, Recorded Basis | 226,550 | 224,185
12 months or longer, Gross Unrealized Losses | (22,382) | (26,566)
Total, Recorded Basis | 271,050 | 240,549
Total, Gross Unrealized Losses | (22,437) | (26,648)
Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | 6,202 | 20
Less than 12 months, Gross Unrealized Losses | (17) |
12 months or longer, Recorded Basis | 60,762 | 60,065
12 months or longer, Gross Unrealized Losses | (5,441) | (6,409)
Total, Recorded Basis | 66,964 | 60,085
Total, Gross Unrealized Losses | (5,458) | (6,409)
Restricted Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | 38,298 | 16,344
Less than 12 months, Gross Unrealized Losses | (38) | (82)
12 months or longer, Recorded Basis | 165,788 | 164,120
12 months or longer, Gross Unrealized Losses | (16,941) | (20,157)
Total, Recorded Basis | 204,086 | 180,464
Total, Gross Unrealized Losses | (16,979) | (20,239)
Corporate Bonds [Member] | Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | 20 | 20
12 months or longer, Recorded Basis | 25,766 | 25,377
12 months or longer, Gross Unrealized Losses | (1,950) | (2,365)
Total, Recorded Basis | 25,786 | 25,397
Total, Gross Unrealized Losses | (1,950) | (2,365)
Corporate Bonds [Member] | Restricted Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | 5,214 | 11,142
Less than 12 months, Gross Unrealized Losses | (10) | (15)
12 months or longer, Recorded Basis | 72,543 | 71,716
12 months or longer, Gross Unrealized Losses | (6,069) | (7,287)
Total, Recorded Basis | 77,757 | 82,858
Total, Gross Unrealized Losses | (6,079) | (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 | 12,589 | 12,531
12 months or longer, Gross Unrealized Losses | (121) | (203)
Total, Recorded Basis | 12,589 | 12,531
Total, Gross Unrealized Losses | (121) | (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 | 16,037 | 15,871
12 months or longer, Gross Unrealized Losses | (738) | (914)
Total, Recorded Basis | 16,037 | 15,871
Total, Gross Unrealized Losses | (738) | (914)
U.S. Treasuries [Member] | Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
12 months or longer, Recorded Basis | 11,551 | 11,320
12 months or longer, Gross Unrealized Losses | (911) | (1,140)
Total, Recorded Basis | 11,551 | 11,320
Total, Gross Unrealized Losses | (911) | (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 | 31,959 | 1,399
Less than 12 months, Gross Unrealized Losses | (14) | (29)
12 months or longer, Recorded Basis | 47,726 | 46,656
12 months or longer, Gross Unrealized Losses | (5,222) | (6,319)
Total, Recorded Basis | 79,685 | 48,055
Total, Gross Unrealized Losses | (5,236) | (6,348)
Mortgage-Backed Securities [Member] | Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
12 months or longer, Recorded Basis | 9,551 | 9,536
12 months or longer, Gross Unrealized Losses | (2,366) | (2,592)
Total, Recorded Basis | 9,551 | 9,536
Total, Gross Unrealized Losses | (2,366) | (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 | 1,080 | 3,360
Less than 12 months, Gross Unrealized Losses | (14) | (37)
12 months or longer, Recorded Basis | 29,482 | 29,877
12 months or longer, Gross Unrealized Losses | (4,912) | (5,637)
Total, Recorded Basis | 30,562 | 33,237
Total, Gross Unrealized Losses | (4,926) | (5,674)
Asset-Backed Securities [Member] | Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | 6,182 |
Less than 12 months, Gross Unrealized Losses | (17) |
12 months or longer, Recorded Basis | 1,305 | 1,301
12 months or longer, Gross Unrealized Losses | (93) | (109)
Total, Recorded Basis | 7,487 | 1,301
Total, Gross Unrealized Losses | (110) | (109)
Asset-Backed Securities [Member] | Restricted Investments [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 months, Recorded Basis | 45 | 443
Less than 12 months, Gross Unrealized Losses |  | (1)
Total, Recorded Basis | $ 45 | 443
Total, Gross Unrealized Losses |  | $ (1)

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