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Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | $ 318,184 | $ 346,087
Gross Unrealized Gains (Losses) | (35,896) | (38,140)
Recorded Basis | 282,288 | 307,947
Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 95,240 | 77,746
Gross Unrealized Gains (Losses) | (10,582) | (9,421)
Recorded Basis | 84,658 | 68,325
Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 211,280 | 228,045
Gross Unrealized Gains (Losses) | (25,314) | (28,719)
Recorded Basis | 185,966 | 199,326
Money Market Funds [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 11,664 | 40,296
Recorded Basis | 11,664 | 40,296
Money Market Funds [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 28 | 646
Recorded Basis | 28 | 646
Corporate Bonds [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 38,592 | 38,489
Gross Unrealized Gains (Losses) | (4,891) | (5,181)
Recorded Basis | 33,701 | 33,308
Corporate Bonds [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 82,628 | 81,993
Gross Unrealized Gains (Losses) | (10,591) | (11,296)
Recorded Basis | 72,037 | 70,697
Asset Backed Securities [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 13,684 | 13,709
Gross Unrealized Gains (Losses) | (494) | (737)
Recorded Basis | 13,190 | 12,972
Asset Backed Securities [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 798 | 9
Gross Unrealized Gains (Losses) | (6) |
Recorded Basis | 792 | 9
Mortgage Backed Securities [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 15,622 | 16,135
Gross Unrealized Gains (Losses) | (3,089) | (3,139)
Recorded Basis | 12,533 | 12,996
Mortgage Backed Securities [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 44,462 | 46,138
Gross Unrealized Gains (Losses) | (5,897) | (6,045)
Recorded Basis | 38,565 | 40,093
U.S. Treasuries [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 12,442 |
Gross Unrealized Gains (Losses) | (1,522) |
Recorded Basis | 10,920 |
U.S. Treasuries [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 56,925 | 66,479
Gross Unrealized Gains (Losses) | (7,398) | (9,222)
Recorded Basis | 49,527 | 57,257
U.S. Government Agency Securities [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 12,876 | 7,369
Gross Unrealized Gains (Losses) | (543) | (302)
Recorded Basis | 12,333 | 7,067
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 | 18,432 | 26,479
Gross Unrealized Gains (Losses) | (1,422) | (2,156)
Recorded Basis | 17,010 | 24,323
Emerging Markets [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 2,024 | 2,044
Gross Unrealized Gains (Losses) | (43) | (62)
Recorded Basis | 1,981 | 1,982
Mutual Funds [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 8,007 | 6,301
Recorded Basis | 8,007 | 6,301
Marketable Securities Current [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 11,664 | 40,296
Recorded Basis | $ 11,664 | $ 40,296

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