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Derivative and Other Financial Instruments and Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Long-term debt    
Asset-Based Facility $ 86.5  
Carrying Value | Level 1    
Assets    
Cash and cash equivalents 12.8 $ 27.2
Restricted cash and restricted cash equivalents 5.6 5.5
Carrying Value | Level 2    
Assets    
Financing receivable 28.1 28.4
Carrying Value | Level 3    
Long-term debt    
Redeemable Preferred Stock 25.6 24.9
Carrying Value | Level 3 | Other Noncurrent Assets    
Assets    
Loans receivable, net, carrying amount 0.7 0.8
Carrying Value | Senior Secured Notes | Level 1    
Long-term debt    
Senior Secured Notes 298.3 294.9
Carrying Value | ABL Facility | Level 2    
Long-term debt    
Asset-Based Facility 85.7  
Carrying Value | Asset-Based Facility | Level 2    
Long-term debt    
Asset-Based Facility   55.5
Carrying Value | Term Loan | Level 2    
Long-term debt    
Term Loan   1.5
Estimated Fair Value | Level 1    
Assets    
Cash and cash equivalents 12.8 27.2
Restricted cash and restricted cash equivalents 5.6 5.5
Estimated Fair Value | Level 2    
Assets    
Financing receivable 28.1 28.4
Estimated Fair Value | Level 3    
Long-term debt    
Redeemable Preferred Stock 26.6 26.8
Estimated Fair Value | Level 3 | Other Noncurrent Assets    
Assets    
Loans receivable, net, carrying amount 0.7 0.8
Estimated Fair Value | Senior Secured Notes | Level 1    
Long-term debt    
Senior Secured Notes 286.7 307.5
Estimated Fair Value | ABL Facility | Level 2    
Long-term debt    
Asset-Based Facility $ 86.5  
Estimated Fair Value | Asset-Based Facility | Level 2    
Long-term debt    
Asset-Based Facility   57.0
Estimated Fair Value | Term Loan | Level 2    
Long-term debt    
Term Loan   $ 1.5