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Schedule of Accounts Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables [Abstract] |  |
Billed and billable | $ 121,336 | $ 176,848
Less: allowance for doubtful accounts | (3,334) | (5,489)
Accounts receivable, net | $ 118,002 | $ 171,359

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