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Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | $ 361,158,000 | $ 399,680,000
Gross Unrealized Gains (Losses) | (42,570,000) | 1,491,000
Recorded Basis | 318,588,000 | 401,171,000
Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 83,841,000 | 96,959,000
Gross Unrealized Gains (Losses) | (10,656,000) | (196,000)
Recorded Basis | 73,185,000 | 96,763,000
Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 247,530,000 | 289,337,000
Gross Unrealized Gains (Losses) | (31,914,000) | 1,687,000
Recorded Basis | 215,616,000 | 291,024,000
Money Market Funds [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 29,787 | 13,384,000
Recorded Basis | 29,787,000 | 13,384,000
Money Market Funds [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 553,000 | 528,000
Recorded Basis | 553,000 | 528,000
Corporate Bonds [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 38,552,000 | 41,954,000
Gross Unrealized Gains (Losses) | (5,923,000) | (136,000)
Recorded Basis | 32,629,000 | 41,818,000
Corporate Bonds [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 90,292,000 | 117,700,000
Gross Unrealized Gains (Losses) | (12,900,000) | (17,000)
Recorded Basis | 77,392,000 | 117,683,000
U.S. Treasuries [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 66,397,000 | 67,614,000
Gross Unrealized Gains (Losses) | (9,725,000) | (342,000)
Recorded Basis | 56,672,000 | 67,272,000
Asset Backed Securities [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 19,496,000 | 29,533,000
Gross Unrealized Gains (Losses) | (1,097,000) | (38,000)
Recorded Basis | 18,399,000 | 29,495,000
Asset Backed Securities [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 28,000 | 107,000
Gross Unrealized Gains (Losses) |  | 1,000
Recorded Basis | 28,000 | 108,000
Mortgage Backed Securities [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 16,366,000 | 18,089,000
Gross Unrealized Gains (Losses) | (3,255,000) | (440,000)
Recorded Basis | 13,111,000 | 17,649,000
Mortgage Backed Securities [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 52,309,000 | 64,217,000
Gross Unrealized Gains (Losses) | (6,965,000) | 764,000
Recorded Basis | 45,344,000 | 64,981,000
U.S. Government Agency Securities [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 7,373,000 | 7,383,000
Gross Unrealized Gains (Losses) | (301,000) | 418,000
Recorded Basis | 7,072,000 | 7,801,000
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 | 31,827,000 | 32,898,000
Gross Unrealized Gains (Losses) | (2,324,000) | 1,281,000
Recorded Basis | 29,503,000 | 34,179,000
Mutual Funds [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 6,124,000 | 6,273,000
Recorded Basis | 6,124,000 | 6,273,000
Emerging Markets [Member] | Investments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 2,054,000 |
Gross Unrealized Gains (Losses) | (80,000) |
Recorded Basis | 1,974,000 |
Marketable Securities Current [Member] | Cash and Cash Equivalents [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Cost | 29,787,000 | 13,384,000
Recorded Basis | $ 29,787,000 | $ 13,384,000

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