General Information - Reconciliation of Total Interest Cost to Interest Expense, Net of Amounts Capitalized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest Costs Incurred [Abstract]
Total interest cost, including amortization of debt issuance costs	$ 27,016	$ 23,830	$ 83,888	$ 84,254
Capitalized interest	(7,984)	(2,480)	(15,184)	(13,454)
Total interest expense as reported	$ 19,032	$ 21,350	$ 68,704	$ 70,800