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Accounts Payable (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts Payable |  |
Accounts payable–media and data | $ 477,716 | $ 307,018
Accounts payable–other | 12,661 | 14,145
Total | $ 490,377 | $ 321,163

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