Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax reform, provisional amount	$ 55,400,000
Tax reform, remeasurement of deferred tax balance	55,800,000
Tax reform, one-time transition tax	$ (368,000)
Document fiscal year focus	2017
Effective income tax rate for continuing operations	45.90%	32.00%	33.60%
Undistributed earnings relating to certain non-U.S. subsidiaries	$ 189,015,000	$ 155,386,000
Net operating loss carryforwards	$ 44,055,000