Quarterly Financial Information (unaudited) - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended					12 Months Ended
	Nov. 16, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information [Line Items]
Income tax provision		$ 9,200	$ 989	$ 5,188	$ 9,350		$ 19,450	$ 43,555	$ 35,527
Total amortization expense							$ 36,400	$ 10,300	$ 6,400
New World Systems Corporation
Quarterly Financial Information [Line Items]
Expenses incurred in acquisition	$ 5,900					$ 5,900
Total amortization expense						$ 3,500