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Income Taxes - Additional Information (Detail)	3 Months Ended
Income Taxes - Additional Information (Detail)	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	18.90%	35.40%
Decrease in effective tax rate	24.50%
Increase in effective tax rate due to partial offset by valuation allowance related to foreign subsidiary	6.20%
Increased in tax rate due to other miscellaneous items	1.80%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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