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Income Taxes - Additional Information (Detail)	3 Months Ended		6 Months Ended
Income Taxes - Additional Information (Detail)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Effective income tax rates	22.40%	23.70%	17.70%	23.50%
Impact of the expiration of the U.S. federal research and development tax credit	1.00%		5.10%

- 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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