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	Dec. 31, 2012
Income Taxes [Line Items]
Valuation allowances	$ 9.4		$ 9.4		$ 1.9
Undistributed non-U.S. subsidiary earnings	15.7		15.7
Unrecognized deferred U.S. income tax liability associated with the indefinitely reinvested undistributed earnings	5.5		5.5
Liability for uncertain tax positions	2.3		2.3		3.8
Reversal of liability for uncertain tax positions			2.2
Effective tax rate	34.60%	34.60%	35.60%	35.00%
Discrete Tax Adjustments
Income Taxes [Line Items]
Discrete adjustment to income tax provision	$ 6.9		$ 4.6
Effective tax rate	49.80%	31.30%	41.30%	35.00%