Common Stock and Other Equity Related Transactions - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Sep. 14, 2012	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Class of Stock [Line Items]
Common Stock, Par or Stated Value Per Share			$ 0.01	$ 0.01
Stockholders' Equity Note, Stock Split, Conversion Ratio		2
Stockholders' Equity Note, Stock Split		On June 25, 2013, management announced a two-for-one split, to be effected by and in the form of a stock dividend, to take effect on July 15, 2013. On July 15, 2013, each common shareholder of record on July 5, 2013, received one additional share of common stock for each share held.On July 15, 2013, we effected a two-for-one stock split of our common stock, by and in the form of a stock dividend and was paid to stockholders of record on July 5, 2013.
At The Market Offering Value						$ 125,000,000
Temporary Equity, Shares Outstanding					8,000,000
Preferred Stock, Shares Authorized			9,945,164	9,945,539
Peferred Stock, Shares Exchanged	5,445,765
Depositary Shares, Issued	5,445,765
Employee Stock Purchase Plan Purchase Price Of Shares			The common stock may be purchased monthly at a price equal to 85% of the lesser of: (a) the closing price for a share of common stock on the last day of the offering period; and (b) the closing price for a share of common stock on the first day of the offering period.
Common stock issued through the employee stock purchase plan			18,411	30,154	29,176
Common Stock, Shares Authorized			200,000,000	100,000,000
Non-Controlling Interests - Common OP Units			7,667,723	7,456,320	8,206,134
Share Based Compensation Arrangement By Share Based Payment Award Repurchased Shares For Taxes			$ 36.48	$ 33.31	$ 31.39
Percentage ownership of the Operating Partnership			91.60%	91.80%
Percentage ownership of the Operating Partnership by the Common OP Unitholders			8.40%	8.20%
Common stock issued in equity offering			0	0	12,075,000
Net proceeds from issuance of Common Stock			0	0	344,049,000
Perpetual Preferred OP Units conversion			0	0	(200,000,000)
Number of acquired site property				1,765	30,129
Depositary Share, Liquidation Preference Per Share	$ 25.00
Preferred Stock, Dividend Rate, Per-Dollar-Amount	$ 0.3849625
Maximum
Class of Stock [Line Items]
Stock purchases under employee stock purchase plan			$ 250,000
Number Of Shares Authorized Employee Stock Purchase Plan			2,000,000
Series B Subordinated Non-Voting Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Stock issued for acquisition properties			0	0	3,480,000
Common Stock
Class of Stock [Line Items]
Stock issued for acquisition properties			0	0	3,416,552
Employee Stock Purchase Plan [Member]
Class of Stock [Line Items]
Employee stock purchase plan amendement date			May 3, 2006