Regular Quarterly Distributions Declared and Paid to Common Stockholders and Common OP Unit Non-Controlling Interests (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Distribution Amount Per Share	$ 0.2500	$ 0.2500	$ 0.2500	$ 0.2500	$ 0.2188	$ 0.2188	$ 0.2188	$ 0.2188	$ 0.1875	$ 0.1875	$ 0.1875	$ 0.1875	$ 0.25
Stockholder Record Date	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 28, 2013	Dec. 14, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 30, 2011	Sep. 30, 2011	Jun. 24, 2011	Mar. 25, 2011
Payment Date	Jan. 10, 2014	Oct. 11, 2013	Jul. 12, 2013	Apr. 12, 2013	Dec. 28, 2012	Oct. 12, 2012	Jul. 13, 2012	Apr. 13, 2012	Jan. 13, 2012	Oct. 14, 2011	Jul. 08, 2011	Apr. 08, 2011