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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	40.00%	33.00%	36.00%	33.00%
U.S. federal statutory tax rate	35.00%
Valuation allowance against deferred tax	$ 0.5		$ 0.5
Gross unrecognized tax benefits	1.4		1.4
Unrecognized tax benefits	$ 0.2		$ 0.2

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Effective Income Tax Rate Continuing Operation

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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-Publisher FASB

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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

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