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
Mar. 31, 2015	Mar. 31, 2014
Debt Disclosure [Abstract]
Interest incurred	$ 11,384us-gaap_InterestExpenseDebt	$ 11,240us-gaap_InterestExpenseDebt
Amortization of deferred debt costs	362	330
Capitalized interest	(340)	(103)
Interest expense and amortization of deferred debt costs	$ 11,406	$ 11,467

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

Mar. 31, 2015

Mar. 31, 2014

Debt Disclosure [Abstract]

Interest incurred

$ 11,384

$ 11,240

Amortization of deferred debt costs

Interest expense and amortization of deferred debt costs

$ 11,406

$ 11,467