Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Assets
Cash and cash equivalents	$ 40.2	$ 35.7	$ 38.5
Financing receivable	40.9	32.7
Long-term debt:
Redeemable Preferred Stock, carrying amount	23.3	21.9
Carrying Amount
Assets
Cash and cash equivalents	40.2	35.7
Financing receivable	40.9	32.7
Long-term debt:
Asset-Based Facility, net	22.1	19.6
Carrying Amount | Other Noncurrent Assets
Assets
Loans receivable, net, carrying amount	1.0	1.1
Carrying Amount | Other Current Assets
Assets
Restricted cash held in escrow (other current assets)		3.9
Carrying Amount | Redeemable Preferred Stock
Long-term debt:
Redeemable Preferred Stock, carrying amount	23.3	21.9
Estimated Fair Value | Level 1
Assets, estimated fair value
Cash and cash equivalents, estimated fair value	40.2	35.7
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Assets, estimated fair value
Financing receivable	40.9	32.7
Long-term debt:
Asset-Based Facility, Estimated Fair value	24.0	22.0
Estimated Fair Value | Level 3
Long-term debt:
Redeemable Preferred Stock, estimated fair value	21.3	18.7
Estimated Fair Value | Other Noncurrent Assets | Level 3
Assets, estimated fair value
Loans receivable, net, estimated fair value	1.0	1.1
Estimated Fair Value | Other Current Assets | Level 1
Assets, estimated fair value
Cash and cash equivalents, estimated fair value		3.9
Senior Secured Notes
Long-term debt:
Senior Secured Notes, net	292.7	290.7
Senior Secured Notes | Carrying Amount
Long-term debt:
Senior Secured Notes, net	292.7	290.7
Senior Secured Notes | Estimated Fair Value | Level 1
Long-term debt:
Senior Secured Notes, net	$ 305.0	$ 310.9