General Information - Reconciliation of Total Interest Cost to Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Costs Incurred [Abstract]
Total interest cost, including amortization of debt issuance costs	$ 22,234	$ 19,145	$ 71,229	$ 62,782
Capitalized interest	(20,541)	(10,425)	(53,516)	(26,002)
Total interest expense as reported	$ 1,693	$ 8,720	$ 17,713	$ 36,780