Income Tax - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Net operating loss carryforwards, foreign	$ 37.7
Deferred income taxes, undistributed foreign earnings	2.2	2.2
Impact of repatriation, net of foreign tax credits	0	0
Unrecognized tax benefits, impact on effective tax rate	1.0	2.7	3.5
Accrued interest and penalties	3.1	5.3	5.7
Increase (decrease) in income tax expense	(2.3)	(0.3)	0.4
Unrecognized tax benefits, gross	$ 2.0
Foreign Countries
Income Taxes [Line Items]
Net operating loss carry forwards expiring in and beyond the stated year	Net operating losses expire in 2014 and later.