General Information - Reconciliation of Total Interest Cost to Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Real Estate And Capitalized Interest [Line Items]
Total interest cost including amortization of debt issuance costs	$ 83,890	$ 84,349	$ 90,698
Capitalized interest	(37,674)	(11,212)
Total interest expense as reported	$ 46,216	$ 73,137	$ 90,698