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Revenues from Contracts with Customers - Summary of Impact to Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Receivables, net | $ 293,148 | $ 210,471
Accrued compensation | 205,732 | 205,395
Current portion of accounts payable, accrued expenses and other liabilities (see note 27) | 165,746 | $ 124,961
ASC 606 [Member] | Under Previous U.S. GAAP [Member] |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Receivables, net | 214,695 |
Accrued compensation | 168,338 |
Current portion of accounts payable, accrued expenses and other liabilities (see note 27) | 148,466 |
ASC 606 [Member] | Effect of Change Higher/(Lower) [Member] |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Receivables, net | 78,453 |
Accrued compensation | 37,394 |
Current portion of accounts payable, accrued expenses and other liabilities (see note 27) | $ 17,280 |

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