Income Taxes - Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate									$ 43,636	$ 30,487	$ 44,731
State income taxes, net of federal benefit									4,950	781	6,075
Detriment (benefit) from lower foreign tax rates									3,655	(8,500)	(7,827)
Valuation allowance on foreign net operating loss carryforward									(450)	253	254
Other expenses not deductible for tax purposes									3,543	2,466	3,082
Adjustment to reserve for uncertain tax positions									(132)	456	(3,547)
Impact of 2017 U.S. tax reform — deferred tax									(706)	(63,525)	0
Impact of 2017 U.S. tax reform — Transition Tax									50	18,655	0
Sale of Ringtail business									3,798	0	0
Other adjustments, net									(1,163)	(1,930)	(485)
Income tax provision (benefit)	$ 7,834	$ 19,964	$ 14,113	$ 15,270	$ (38,458)	$ 9,197	$ 527	$ 7,877	$ 57,181	$ (20,857)	$ 42,283