Schedule III - Changes in Total Real Estate Assets Including Real Estate Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period	$ 1,189,552	[1]	$ 1,191,096	[2]	$ 990,635
Acquisitions	483,162		9,460		240,474
Transfers from construction in progress	81,347		37,174
Additions	7,749		19,971		1,011
Dispositions	(28,616)		(68,149)		(40,460)
Other					(564)
Balance at end of period	$ 1,733,194		$ 1,189,552	[1]	$ 1,191,096	[2]

[1] Includes real estate cost included in real estate held for sale of $28,617 at December 31, 2012. Excludes intangible lease assets that are included in real estate held for sale of $858 for 2012.

[2] Includes real estate cost included in real estate held for sale of $96,766 at December 31, 2011. Excludes intangible lease assets that are included in real estate held for sale of $3,012 for 2011.