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Schedule of Impact of Adoption on Condensed Consolidated Income Statement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Net Revenue before provision for doubtful accounts |  | $ 2,827,709 |  | $ 5,653,181
Less: Provision for doubtful accounts |  | 215,353 |  | 427,967
Net revenues | $ 2,681,353 | 2,612,356 | $ 5,368,869 | 5,225,214
Other operating expenses | 624,484 | $ 632,193 | 1,245,303 | $ 1,239,553
Balances Without Adoption ASC 606 | ASU 2014-09 |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net Revenue before provision for doubtful accounts | 2,953,398 |  | 5,884,925 |
Less: Provision for doubtful accounts | 276,160 |  | 522,703 |
Net revenues | 2,677,238 |  | 5,362,222 |
Other operating expenses | 620,369 |  | 1,238,656 |
Effect of Change | ASU 2014-09 |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenues | 4,115 |  | 6,647 |
Other operating expenses | $ 4,115 |  | $ 6,647 |

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