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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	80.40%	61.30%	44.80%	35.70%
Tax holiday expired			Dec. 31, 2011
Gross unrecognized tax benefits excluding interest and penalties	$ 45,402		$ 45,402		$ 40,674
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	23,570		23,570
Accrued interest on unrecognized tax benefits	$ 2,147		$ 2,147		$ 1,571

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Income tax holiday expiration date.

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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 of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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

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