Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense or benefit
Gross deferred tax assets	40.2
Valuation allowance for net deferred tax assets	31.5
Net deferred tax assets	8.7
Deferred tax liabilities	8.7
Short term deferred tax liabilities	0.8
Current net deferred tax liabilities	7.9	7.4	7.9
Long term deferred tax assets	$ 7.9	$ 7.4	$ 7.9