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Schedule of Impact of Adoption on Condensed Consolidated Income Statement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Net Revenue before provision for doubtful accounts |  | $ 2,775,790 |  | $ 8,428,971
Less: Provision for doubtful accounts |  | 233,926 |  | 661,893
Net revenues | $ 2,648,913 | 2,541,864 | $ 8,017,782 | 7,767,078
Other operating expenses | 651,442 | $ 628,523 | 1,896,745 | $ 1,868,076
Balances Without Adoption ASC 606 | ASU 2014-09 |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net Revenue before provision for doubtful accounts | 2,929,710 |  | 8,814,635 |
Less: Provision for doubtful accounts | 285,044 |  | 807,747 |
Net revenues | 2,644,666 |  | 8,006,888 |
Other operating expenses | 647,195 |  | 1,885,851 |
Effect of Change | ASU 2014-09 |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net revenues | 4,247 |  | 10,894 |
Other operating expenses | $ 4,247 |  | $ 10,894 |

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