v3.6.0.2
Convertible and Long-term Debt Obligations - Asset-Based Credit Facility - Additional Information (Detail) - USD ($)
1 Months Ended
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Carrying Value   $ 5,892,016  
Asset Based Revolving Credit Agreement [Member] | Syndicate of Banks [Member]      
Debt Instrument [Line Items]      
Carrying Value     $ 135,000,000
Asset Based Revolving Credit Agreement [Member] | Syndicate of Banks [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Additional Borrowing Capacity $ 250,000,000    
Line of credit facility, conditional maximum borrowing capacity 750,000,000    
Carrying value of credit agreement liability 200,000,000 969,000,000  
Swing-line loan sub-facility $ 40,000,000    
Maximum amount to be borrowed   1,200,000,000  
Asset Based Revolving Credit Agreement [Member] | Syndicate of Banks [Member] | Revolving Credit Facility [Member] | Federal Funds Purchased      
Debt Instrument [Line Items]      
Line of credit, additional interest rate 0.50%    
Asset Based Revolving Credit Agreement [Member] | Syndicate of Banks [Member] | Revolving Credit Facility [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Line of credit, additional interest rate 1.00%    
Asset Based Revolving Credit Agreement [Member] | Syndicate of Banks [Member] | Revolving Credit Facility [Member] | Undrawn amounts interest rate [Member]      
Debt Instrument [Line Items]      
Line of credit, additional interest rate 0.25%    
Asset Based Revolving Credit Agreement [Member] | Syndicate of Banks [Member] | Swing-Line Loan Sub-Facility [Member]      
Debt Instrument [Line Items]      
Carrying value of credit agreement liability   $ 0