Schedule of long-term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Jan. 08, 2015
Debt Instrument [Line Items]
Capital leases	$ 4.6	$ 4.1
Current portion of long-term debt	(2.3)	(2.3)
Total long-term debt, net	354.2	312.1
Senior Secured Notes
Debt Instrument [Line Items]
Principal amount outstanding	305.0	305.0	$ 305.0
Unamortized original issue discount and debt issuance costs	(10.1)	(14.3)
Senior Secured Notes, net	294.9	290.7
Asset Based Facility
Debt Instrument [Line Items]
Principal amount outstanding	57.0	22.0
Unamortized original issue discount and debt issuance costs	(1.5)	(2.4)
Senior Secured Notes, net	55.5	$ 19.6
Term Loan
Debt Instrument [Line Items]
Term Loan	$ 1.5

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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