Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 44,695	$ 106,316	$ 85,830
State	301	11,549	9,783
Foreign	22,666	5,076	21,262
Total current tax provision	67,662	122,941	116,875
Deferred:
Federal	(36,915)	(264)	(5,247)
State	14,951	(923)	917
Foreign	(10,166)	(14,508)	(15,073)
Total deferred tax benefit	(32,130)	(15,695)	(19,403)
Total provision for income taxes from continuing operations	$ 35,532	$ 107,246	$ 97,472