Income Taxes - Reconciliation of Income Taxes Based on U.S. Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income taxes at the federal statutory rate	$ 4,478	$ 8,561	$ 6,916
Impact of incentive stock options	(145)	261	371
Decrease in valuation allowance	(1,434)	(818)	(12,740)
Foreign tax credit expiration	2,736	818
Capital gain on return of basis			3,079
State taxes, net of federal taxes	(362)	198	334
Non-U.S. earnings taxed at different rates	(1,714)	(834)	(1,606)
Non-deductible mergers and acquisition costs	1,971
R&D Tax credit	(529)
Joint Venture dividend	737
Change in uncertain tax positions		32	(115)
Other permanent differences, net	48	(218)	(166)
Total expense (benefit)	$ 5,786	$ 8,000	$ (3,927)