Income Taxes - Summary of Components of Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal									$ 15,164	$ (3,326)	$ 23,957
State									742	1,686	1,943
Foreign									14,816	13,864	10,029
Current, Total									30,722	12,224	35,929
Deferred
Federal									(47,820)	23,182	1,546
State									(152)	8,284	1,265
Foreign									(3,607)	(1,407)	593
Deferred, Total									(51,579)	30,059	3,404
Income tax provision	$ (38,458)	$ 9,197	$ 527	$ 7,877	$ (1,832)	$ 10,292	$ 15,437	$ 18,386	$ (20,857)	$ 42,283	$ 39,333