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Accounts Payable (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts Payable |  |
Accounts payable—media and data | $ 471,758 | $ 477,716
Accounts payable—other | 21,526 | 12,661
Total | $ 493,284 | $ 490,377

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