Debt - Schedule of Reconciliation of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Disclosure [Abstract]
Corporate-level interest and commitment fees incurred	$ 9,555	$ 8,497	$ 18,220	$ 15,612
Project-level interest and commitment fees incurred	16,892	13,107	31,085	25,468
Capitalized interest, commitment fees, and letter of credit fees	(1,481)	0	(1,481)	0
Amortization of debt discount/premium, net	1,250	1,125	2,477	2,227
Amortization of financing costs	1,389	1,994	2,638	3,852
Other interest	104	116	214	235
Interest expense	$ 27,709	$ 24,839	$ 53,153	$ 47,394