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Interest Costs - Summary of Interest Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule Of Interest [Line Items]    
Interest costs charged to expense $ 24,980 $ 21,539
Amortization of deferred financing costs 1,035 896
Accretion of debt discount on Convertible Notes 5,224 4,681
Amortization of debt premium on Senior Secured Notes (685) (173)
Interest expense 30,554 26,943
Total interest costs 30,598 27,305
Property and Equipment [Member]    
Schedule Of Interest [Line Items]    
Interest costs capitalized 12 4
Software [Member]    
Schedule Of Interest [Line Items]    
Interest costs capitalized $ 32 $ 358