Debt Issuance Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Debt Issuance Costs [Line Items]
Net debt issuance costs	$ 10.3		$ 10.3		$ 11.4
Amortization of debt issuance costs, accelerated amortization			5.0
Debt issuance costs			4.8
Amortization of debt issuance costs	0.6	0.5	1.1	1.3
Other current assets
Debt Issuance Costs [Line Items]
Debt issuance cost current portion	2.2		2.2		2.2
Extinguished Indebtedness
Debt Issuance Costs [Line Items]
Debt issuance cost charged to interest expense			$ 5.0