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Accounts Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accounts Receivable Additional Disclosures [Abstract] |  |
Accounts Receivable, Net, Current | $ 10,522 | $ 6,559
Unbilled accounts receivable | 490,533 | 380,819
Other Receivables | 12,251 | 5,368
Accounts receivable, net | 513,306 | 392,746
Allowance for Doubtful Accounts Receivable, Current | 1,000 | 1,000
Unbilled accounts receivable [Abstract] |  |
Accrued worksite employee payroll cost | 409,653 | 334,836
Unbilled revenues | 100,934 | 81,311
Client Prepayments Included in Cash Balance | (20,054) | (35,328)
Unbilled accounts receivable | $ 490,533 | $ 380,819

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