Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Deferred tax assets, domestic	$ 5,200	$ 5,200
Deferred income tax assets, net operating loss carryforwards	6,568	9,240
Valuation Allowance	800	1,800
Valuation Allowance, Deferred Tax Asset, Change in Amount	(1,000)	(5,000)	$ (200)
Decrease in deferred tax assets and the related valuation allowance		4,700
Discrete tax adjustment		4,500
Undistributed international earnings	119,500	106,200
Effective tax rate due by recognized tax benefits	300	300
Unrecognized tax benefits,interest and penalties	$ 30	30
Minimum
Income Taxes [Line Items]
Deferred income tax assets, operating loss carryforwards expiration period	1 year
Tax returns examination statute of limitations period	3 years
Maximum
Income Taxes [Line Items]
Deferred income tax assets, operating loss carryforwards expiration period	18 years
Tax returns examination statute of limitations period	4 years
Switzerland
Income Taxes [Line Items]
Income tax holiday, aggregate dollar amount	$ 2,700	$ 1,900	$ 1,500
Income tax holiday, income tax benefits per share	$ 0.16	$ 0.11	$ 0.09