Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Derivative financial instruments	$ 5,765	$ 6,350
Net operating losses	2,929	7,786
Research and development credits	2,916	6,346
Depreciation	2,251	1,951
Valuation reserves and accrued liabilities	3,062	2,305
Foreign tax credit	1,775
Stock compensation	1,316	1,021
Inventory	723	438
Patents	654	715
Defined benefit obligation	585	410
Other credits	429	890
Capital lease obligations	370	993
Other	288	926
Deferred tax assets, gross	23,063	30,131
Valuation allowance	(2,199)	(3,702)
Deferred tax liabilities:
Intangible assets	(18,948)	(23,680)
Unrealized foreign currency exchange gains	(2,069)	(2,165)
Undistributed profits of subsidiary	(359)	(518)
Accounts receivable	(4)	(335)
Property and equipment	(220)	(202)
Other	(725)	(547)
Deferred tax liabilities, gross	(22,325)	(27,447)
Net deferred tax asset (liability)	$ (1,461)	$ (1,018)