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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Disclosure Income Taxes Additional Information [Abstract]
Provision for Income Taxes	$ 15,387	$ 17,130	$ 22,950	$ 24,865
Effective tax rate (as a percent)	34.00%	44.00%	35.00%	44.00%
Increase (decrease) in deferred tax assets, changes in unrealized gain (loss) on marketable securities			(552)	77
Increase (decrease) in deferred tax assets, changes in foreign currency translation adjustments			(1,453)	1,152
Unrecognized Tax Benefits	623		623
Unrecognized tax benefits that would affect the effective tax rate	474		474
Income tax penalties and interest expense	18		35
Income tax penalties and interest accrued	$ 250		$ 250

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Increase (Decrease) in Deferred Tax Assets Associated With Changes in Foreign Currency Translation Adjustment Gain Loss in Accumulated Other Comprehensive Income Loss

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Increase (Decrease) in Deferred Tax Assets Associated With Changes in Unrealized Gain Loss on Marketable Securities in Accumulated Other Comprehensive Income Loss

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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