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Income Tax - Additional Information (Detail) (USD $)	12 Months Ended
Income Tax - Additional Information (Detail) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Undistributed earnings relating to certain non-U.S. subsidiaries	$ 44,643,000	$ 38,749,000
Deferred tax liabilities, undistributed foreign earnings	0	0
Unrecognized tax benefits classified as Long term income taxes payable	7,837,000	5,509,000	4,988,000
Reserves related to potential interest	$ 496,000	$ 331,000
Tax years that are open to examination	Tax years 2006 through 2010 remain open to examination by certain tax jurisdictions to which the Company is subject

The amount as of the balance sheet date of the estimated future tax effects attributable to undistributed earnings of subsidiaries and other recognized entities in countries outside the country of domicile which will increase future taxable income when such earnings are distributed into the country of domicile.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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