Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	$ 33,348		$ 28,678
Amount included in accounts receivable	10,717		13,088
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense	1,800		1,300
Related party transaction expense	3,500	$ 3,600
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense	1,500		1,100
Prepaid expenses and other current assets	100		200
Amount included in accounts receivable	700		$ 600
Related party transaction expense	$ 1,300	$ 1,700