Debt and Redeemable Preferred Stock - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Feb. 27, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Amortization of debt issuance costs				$ 2.4	$ 2.4
Capital leases due within next twelve months		$ 2.4		2.4
Capital leases		4.3		$ 4.3
Redeemable Preferred Stock
Debt Instrument [Line Items]
Preferred stock, dividend payment terms				Dividends may be paid in-kind for the first two years, and thereafter will be paid in cash.
Liquidation preference value		27.4		$ 27.4
Preferred stock redemption period				66 months
Redeemable Preferred Stock | First Eighteen Months
Debt Instrument [Line Items]
Redeemable preferred stock dividends rate	7.00%
Redeemable Preferred Stock | Next Twelve Months
Debt Instrument [Line Items]
Redeemable preferred stock dividends rate	8.00%
Redeemable Preferred Stock | Thereafter
Debt Instrument [Line Items]
Redeemable preferred stock dividends rate	9.00%
Senior Secured Notes
Debt Instrument [Line Items]
Debt, interest expense		$ 8.5	$ 8.7	$ 17.3	16.7
Debt, due date		Jan. 15, 2019
Amortization of debt issuance costs		$ 1.0	1.1	2.0	2.1
Asset Based Facility
Debt Instrument [Line Items]
Debt, interest expense		0.6	0.5	1.0	0.6
Amortization of debt issuance costs		$ 0.2	$ 0.2	$ 0.4	$ 0.2