Derivative and Other Financial Instruments and Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Carrying Value | Level 1
Assets
Cash and cash equivalents	$ 24.9	$ 27.2
Restricted cash and restricted cash equivalents	7.9	5.5
Carrying Value | Level 2
Assets
Financing receivable	16.5	28.4
Carrying Value | Level 3
Long-term debt
Redeemable Preferred Stock	28.5	24.9
Carrying Value | Level 3 | Other Noncurrent Assets
Assets
Loans receivable, net, carrying amount	0.7	0.8
Carrying Value | RA DIP ABL Facility | Level 2
RA DIP Financing
DIP Financing	66.7
Carrying Value | New Money DIP Term Notes | Level 2
RA DIP Financing
DIP Financing	37.2
Carrying Value | Roll Up DIP Term Notes | Level 1
Liabilities subject to compromise
Liabilities subject to compromise	170.0
Carrying Value | Senior Secured Notes | Level 1
Liabilities subject to compromise
Liabilities subject to compromise	135.0
Long-term debt
Notes payable		294.9
Carrying Value | Revolving Credit Facilities | Level 2
Long-term debt
Notes payable		55.5
Carrying Value | Term Loan | Level 2
Long-term debt
Notes payable		1.5
Estimated Fair Value | Level 1
Assets
Cash and cash equivalents	24.9	27.2
Restricted cash and restricted cash equivalents	7.9	5.5
Estimated Fair Value | Level 2
Assets
Financing receivable	16.5	28.4
Estimated Fair Value | Level 3
Long-term debt
Redeemable Preferred Stock	13.1	26.8
Estimated Fair Value | Level 3 | Other Noncurrent Assets
Assets
Loans receivable, net, carrying amount	0.7	0.8
Estimated Fair Value | RA DIP ABL Facility | Level 2
RA DIP Financing
DIP Financing	67.9
Estimated Fair Value | New Money DIP Term Notes | Level 2
RA DIP Financing
DIP Financing	40.0
Estimated Fair Value | Roll Up DIP Term Notes | Level 1
Liabilities subject to compromise
Liabilities subject to compromise	124.5
Estimated Fair Value | Senior Secured Notes | Level 1
Liabilities subject to compromise
Liabilities subject to compromise	$ 98.9
Long-term debt
Notes payable		307.5
Estimated Fair Value | Revolving Credit Facilities | Level 2
Long-term debt
Notes payable		57.0
Estimated Fair Value | Term Loan | Level 2
Long-term debt
Notes payable		$ 1.5