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Schedule of Impact of Adoption on Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Revenue before provision for doubtful accounts |  |  |  |  |  |  |  |  |  | $ 11,278,942 | $ 10,507,788
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  |  | 869,077 | 741,578
Net revenues | $ 2,754,496 | $ 2,648,913 | $ 2,681,353 | $ 2,687,516 | $ 2,642,787 | $ 2,541,864 | $ 2,612,356 | $ 2,612,858 | $ 10,772,278 | 10,409,865 | 9,766,210
Other operating expenses |  |  |  |  |  |  |  |  | 2,614,687 | $ 2,493,062 | $ 2,359,339
Balances Without Adoption ASC 606 | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Revenue before provision for doubtful accounts |  |  |  |  |  |  |  |  | 11,846,088 |  |
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  | 1,088,267 |  |
Net revenues |  |  |  |  |  |  |  |  | 10,757,821 |  |
Other operating expenses |  |  |  |  |  |  |  |  | 2,600,230 |  |
Effect of Change | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 14,457 |  |
Other operating expenses |  |  |  |  |  |  |  |  | $ 14,457 |  |

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