Income Taxes - Reconciliation of Income Taxes Based on U.S. Federal Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income taxes at the federal statutory rate	$ (2,490)	$ (7,803)	$ 4,478
Decrease in U.S. valuation allowance	1,882		(1,434)
Foreign tax credit (additions) expiration	(2,545)	(1,343)	2,736
State taxes, net of federal taxes	(1,558)	(1,592)	(362)
Non-U.S. earnings taxed at different rates	(2,938)	(2,308)	(1,714)
Non-deductible mergers and acquisition costs		1,299	1,971
R&D Tax credit	(282)	(623)	(529)
Change in uncertain tax positions	(994)
Other permanent differences, net	(388)	1,852	640
Total expense (benefit)	$ (9,313)	$ (10,518)	$ 5,786