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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Debt Disclosure [Abstract]
Interest incurred	$ 11,415	$ 11,488	$ 33,998	$ 34,323
Amortization of deferred debt costs	355	309	969	934
Capitalized interest	(186)	(59)	(430)	(93)
Interest expense and amortization of deferred debt costs	$ 11,584	$ 11,738	$ 34,537	$ 35,164