Income Taxes - Reconciliation of Income Taxes Based on U.S. Federal Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income taxes at the federal statutory rate	$ (7,803)	$ 4,478	$ 8,561
Impact of incentive stock options		(145)	261
Decrease in U.S. valuation allowance		(1,434)	(818)
Foreign tax credit (additions) expiration	(1,343)	2,736	818
Capital gain on return of basis	0	0	0
State taxes, net of federal taxes	(1,592)	(362)	198
Non-U.S. earnings taxed at different rates	(2,308)	(1,714)	(834)
Non-deductible mergers and acquisition costs	1,299	1,971
R&D Tax credit	(623)	(529)
Joint Venture dividend	1,147	737
Change in uncertain tax positions			32
Other permanent differences, net	705	48	(218)
Total expense (benefit)	$ (10,518)	$ 5,786	$ 8,000