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Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid expenses $ 131,833 $ 105,216
Funds on deposit with third parties 75,877 82,679
Other 2,894 2,427
Other current assets $ 210,604 $ 190,322