Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Real estate assets, net	$ 3,223,672	$ 2,991,722
Investments in unconsolidated real estate ventures	100,455	106,313
Cash and cash equivalents	81,699	30,785
Restricted cash	22,803	16,976
Receivables from related parties and affiliated real estate joint ventures	7,928	11,078
Other assets, net	81,682	66,603
Total assets	3,518,239	3,223,477
Liabilities, Noncontrolling Interests and Equity:
Notes payable	1,402,432	1,369,690
Premium on notes payable	2,336	3,319
Exchangeable senior notes	250,000
Discount on exchangeable senior notes	(17,299)
Notes payable to trusts	119,590	119,590
Lines of credit		85,000
Accounts payable and accrued expenses	58,248	52,299
Other liabilities	34,052	48,248
Total liabilities	1,849,359	1,678,146
Commitments and contingencies
Noncontrolling interest represented by Preferred Operating Partnership units	33,713
Extra Space Storage Inc. stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding
Common stock, $0.01 par value, 300,000,000 shares authorized, 111,236,044 and 110,737,205 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	1,112	1,107
Paid-in capital	1,766,691	1,740,037
Accumulated other comprehensive income (deficit)	3,146	(14,273)
Accumulated deficit	(256,640)	(235,064)
Total Extra Space Storage Inc. stockholders' equity	1,514,309	1,491,807
Noncontrolling interest represented by Preferred Operating Partnership units, net of $100,000 note receivable	29,880	29,918
Noncontrolling interests in Operating Partnership	90,504	22,492
Other noncontrolling interests	474	1,114
Total noncontrolling interests and equity	1,635,167	1,545,331
Total liabilities, noncontrolling interests and equity	$ 3,518,239	$ 3,223,477