Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Federal	Dec. 31, 2012 State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Accrued interest related to uncertain tax positions	$ 0.7	$ 0.5	$ 0.8
Accrued penalties related to uncertain tax positions	0.5	0.2	0.4
Unrecognized tax benefits that would affect our effective tax rate	5.8	5.0	5.8
Unrecognized tax benefits possible change, estimated range, lower bound	0
Unrecognized tax benefits possible change, estimated range, upper bound	2.7
Loss carry forwards for U.S. federal	13.9	14.0
Loss carry forwards for non-U.S.	7.8	12.4
Operating loss carry forwards, expiration dates				2018 and 2031	2019 and 2032
Loss carry forwards, subject to expiration amount	3.7
Loss carry forwards, not subject to expiration amount	4.1
Foreign capital loss carry forward	1.0	1.1
Deferred tax assets, capital loss carry forwards	0.2	0.2
Operating loss and credit carry forwards	38.8	18.0
Operating loss carry forwards, valuation allowance	$ 1.5	$ 0.3