Long-Term Debt and Redeemable Preferred Stock - Components of Long-Term Debt and Redeemable Preferred Stock (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument And Redeemable Preferred Stock [Line Items]
Long-term debt, gross	$ 1,167.3		$ 1,173.4
Less current portion	(21.5)	[1]	(8.0)	[1]
Long-term debt noncurrent	1,145.8		1,165.4
Redeemable preferred stock	48.4
Redeemable preferred stock			48.4
Long-term debt and redeemable preferred stock	1,194.2		1,213.8
2011 Term Loan Facility Due 2017 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Term Loan Facility, net of discounts	780.9		787.6
2011 Revolving Credit Facility Due 2016 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Revolving credit facility
9 3/4% Senior Secured Notes Due 2015 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Senior Secured Notes, net of discounts	328.0		327.4
Amended and Restated Senior Subordinated Term Loan Due 2014 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Senior Subordinated Term Loan	58.4
Senior Subordinated Term Loan Due 2014 [Member]
Debt Instrument And Redeemable Preferred Stock [Line Items]
Senior Subordinated Term Loan			$ 58.4

[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").