Income Taxes - Details of Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
U.S. Federal benefit		$ (0.1)	$ (0.1)
State and local tax (benefit)	0.1	0.1	(0.2)
Total current	0.1		(0.3)
Deferred:
U.S. Federal tax (benefit)
State and local tax
Total deferred
Total income benefit	$ 0.1		$ (0.3)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.