Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Debt Disclosure [Abstract]
Interest incurred	$ 11,342	$ 11,429	$ 22,582	$ 22,835
Amortization of deferred debt costs	284	314	614	625
Capitalized interest	(140)	(34)	(243)	(34)
Interest expense and amortization of deferred debt costs	$ 11,486	$ 11,709	$ 22,953	$ 23,426