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Interest Costs - Summary of Interest Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule Of Interest [Line Items]        
Interest costs charged to expense $ 21,936 $ 19,598 $ 65,164 $ 42,780
Amortization of deferred financing costs 919 818 2,718 2,981
Accretion of debt discount on Convertible Notes 4,945 4,432 14,438 12,940
Amortization of debt premium on Senior Secured Notes (215)   (566)  
Interest expense 27,585 24,848 81,754 58,701
Total interest costs 27,787 25,161 82,573 59,849
Property and Equipment [Member]        
Schedule Of Interest [Line Items]        
Interest costs capitalized 9 34 15 187
Software [Member]        
Schedule Of Interest [Line Items]        
Interest costs capitalized $ 193 $ 279 $ 804 $ 961