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Long-Term Debt Obligations - Schedule of Interest Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Disclosure [Abstract]        
Contractual interest coupon $ 15,533 $ 10,588 $ 25,892 $ 21,136
Amortization of debt issuance costs 1,470 1,642 2,940 3,257
Amortization of debt discounts 33,467 30,525 61,541 60,384
Total $ 50,470 $ 42,755 $ 90,373 $ 84,777