Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Assets
Cash and cash equivalents	$ 38.5	$ 62.0	$ 44.5
Liabilities
Long-term debt:	339.8
Asset-Based Facility, net	48.2
Capital leases	3.9
Liabilities, estimated fair value
Long-term debt:	339.8
Discontinued Operations
Liabilities
Long-term debt:		9.7
Lines of credit, carrying amount		1.0
Liabilities, estimated fair value
Long-term debt:		9.7
Senior Secured Notes
Liabilities
Senior Secured Notes, net	289.2
Carrying Amount
Assets
Cash and cash equivalents	38.5	62.0
Liabilities
Asset-Based Facility, net	48.2
Capital leases	3.9
Carrying Amount | Discontinued Operations
Assets
Cash and cash equivalents		1.0
Liabilities
Lines of credit, carrying amount		1.0
Long-term debt, carrying amount		13.6
Carrying Amount | Senior Secured Notes
Liabilities
Senior Secured Notes, net	289.2
Carrying Amount | Other Current Assets
Assets
Restricted cash held in escrow (other current assets)	3.9
Carrying Amount | Other Noncurrent Assets
Assets
Loans receivable, net, carrying amount	1.2	1.2
Estimated Fair Value | Quoted Prices in Active Markets (Level 1)
Assets, estimated fair value
Cash and cash equivalents, estimated fair value	38.5	62.0
Estimated Fair Value | Quoted Prices in Active Markets (Level 1) | Discontinued Operations
Assets, estimated fair value
Cash and cash equivalents, estimated fair value		1.0
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Liabilities, estimated fair value
Capital leases, estimated fair value	3.9
Redeemable Preferred Stock, estimated fair value	19.6
Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Discontinued Operations
Liabilities, estimated fair value
Lines of credit, estimated fair value		1.0
Long-term debt, estimated fair value		13.6
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Liabilities, estimated fair value
Asset-Based Facility, Estimated Fair value	48.2
Estimated Fair Value | Senior Secured Notes | Quoted Prices in Active Markets (Level 1)
Liabilities, estimated fair value
Senior Secured Notes, net	313.4
Estimated Fair Value | Other Current Assets | Quoted Prices in Active Markets (Level 1)
Assets, estimated fair value
Cash and cash equivalents, estimated fair value	3.9
Estimated Fair Value | Other Noncurrent Assets | Significant Unobservable Inputs (Level 3)
Assets, estimated fair value
Loans receivable, net, estimated fair value	1.2	$ 1.2
Redeemable Preferred Stock
Liabilities
Redeemable Preferred Stock, carrying amount	20.5
Redeemable Preferred Stock | Carrying Amount
Liabilities
Redeemable Preferred Stock, carrying amount	$ 20.5