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Convertible Notes and Long-term Debt Obligations - Warehouse Line of Credit - Additional Information (Detail) - Secured Debt [Member] - Warehouse Agreement Borrowings [Member] - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2015
Debt Instrument [Line Items]      
Secured asset based line of credit $ 150,000,000   $ 100,000,000
Line of credit facility, additional principal amount $ 50,000,000    
Interest rate on undrawn amount   0.50%  
Line of credit facility, expiration date   Mar. 31, 2017  
LIBOR [Member]      
Debt Instrument [Line Items]      
Line of credit, additional interest rate   1.65%  
Maximum [Member]      
Debt Instrument [Line Items]      
Borrowings limits of net present value   72.00%