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Accounts Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts Receivable Additional Disclosures [Abstract] |  |
Accounts Receivable, Net, Current | $ 6,559 | $ 12,731
Unbilled accounts receivable | 380,819 | 448,088
Other Receivables | 5,368 | 4,960
Accounts receivable, net | 392,746 | 465,779
Allowance for Doubtful Accounts Receivable, Current | 1,000 | 900
Unbilled accounts receivable [Abstract] |  |
Accrued worksite employee payroll cost | 334,836 | 401,859
Unbilled revenues | 81,311 | 105,841
Client Prepayments Included in Cash Balance | (35,328) | (59,612)
Unbilled accounts receivable | $ 380,819 | $ 448,088

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