Long-Term Debt and Redeemable Preferred Stock - Components of Long-Term Debt and Redeemable Preferred Stock (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012 2011 Term Loan Facility Due 2017 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Current portion of long-term debt	$ (21.5)	[1]	$ (8.0)	[1]
Repayments of secured debt					$ 2.0

[1] The Company classified $21.5 million of long-term debt as a current liability, which is comprised of the Company's regularly scheduled $2.0 million principal repayment due on March 31, 2013 as well as the required "excess cash flow" payment (as defined under the 2011 Term Loan Agreement) to be made in 2013. (See below under "2011 Credit Agreements").