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Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost $ 272,153 $ 325,163
Gross Unrealized Gains 145 48
Gross Unrealized Losses (19,872) (26,648)
Recorded Basis 252,426 298,563
Cash and Cash Equivalents [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 8,314 26,661
Recorded Basis 8,314 26,661
Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 69,096 72,886
Gross Unrealized Gains 15 15
Gross Unrealized Losses (5,014) (6,409)
Recorded Basis 64,097 66,492
Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 194,743 225,616
Gross Unrealized Gains 130 33
Gross Unrealized Losses (14,858) (20,239)
Recorded Basis 180,015 205,410
Money Market Funds [Member] | Cash and Cash Equivalents [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 8,314 26,661
Recorded Basis 8,314 26,661
Money Market Funds [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 101 216
Recorded Basis 101 216
Corporate Bonds [Member] | Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 27,901 27,954
Gross Unrealized Gains 5 3
Gross Unrealized Losses (1,660) (2,365)
Recorded Basis 26,246 25,592
Corporate Bonds [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 81,572 100,030
Gross Unrealized Gains 51 16
Gross Unrealized Losses (5,123) (7,302)
Recorded Basis 76,500 92,744
U.S. Treasuries [Member] | Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 14,260 12,460
Gross Unrealized Losses (849) (1,140)
Recorded Basis 13,411 11,320
U.S. Treasuries [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 53,054 54,900
Gross Unrealized Gains 11  
Gross Unrealized Losses (4,540) (6,348)
Recorded Basis 48,525 48,552
Mortgage-Backed Securities [Member] | Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 11,663 12,128
Gross Unrealized Losses (2,335) (2,592)
Recorded Basis 9,328 9,536
Mortgage-Backed Securities [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 39,274 40,858
Gross Unrealized Gains 53 10
Gross Unrealized Losses (4,737) (5,674)
Recorded Basis 34,590 35,194
U.S. Government Agency Securities [Member] | Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 7,687 12,734
Gross Unrealized Losses (89) (203)
Recorded Basis 7,598 12,531
U.S. Government Agency Securities [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 6,686 16,785
Gross Unrealized Losses (455) (914)
Recorded Basis 6,231 15,871
Asset-Backed Securities [Member] | Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 7,585 7,610
Gross Unrealized Gains 10 12
Gross Unrealized Losses (81) (109)
Recorded Basis 7,514 7,513
Asset-Backed Securities [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 1,527 1,666
Gross Unrealized Gains 9 6
Gross Unrealized Losses (3) (1)
Recorded Basis 1,533 1,671
Emerging Markets [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 199 200
Gross Unrealized Gains 6 1
Recorded Basis 205 201
Mutual Funds [Member] | Restricted Cash and Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cost 12,330 10,961
Recorded Basis $ 12,330 $ 10,961