Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Derivative financial instruments	$ 5,467	$ 5,765
Net operating losses	3,599	2,929
Research and development credits	1,130	2,916
Depreciation	2,682	2,251
Valuation reserves and accrued liabilities	3,090	3,062
Foreign tax credit	222	1,775
Stock compensation	1,887	1,316
Inventory	739	723
Patents	722	654
Defined benefit obligation	662	585
Other credits	365	429
Capital lease obligations	273	370
Other	219	288
Deferred tax assets, gross	21,057	23,063
Valuation allowance	(2,199)	(2,199)
Deferred tax liabilities:
Intangible assets	(15,836)	(18,948)
Unrealized foreign currency exchange gains	(1,637)	(2,069)
Undistributed profits of subsidiary	(1,367)	(359)
Accounts receivable		(4)
Property and equipment	(193)	(220)
Other	(791)	(725)
Deferred tax liabilities, gross	(19,824)	(22,325)
Net deferred tax asset (liability)	$ (966)	$ (1,461)