Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Real estate assets, net	$ 2,995,510	$ 2,991,722
Investments in unconsolidated real estate ventures	102,102	106,313
Cash and cash equivalents	35,575	30,785
Restricted cash	20,157	16,976
Receivables from related parties and affiliated real estate joint ventures	9,096	11,078
Other assets, net	66,656	66,603
Total assets	3,229,096	3,223,477
Liabilities, Noncontrolling Interests and Equity:
Notes payable	1,361,554	1,369,690
Premium on notes payable	2,754	3,319
Notes payable to trusts	119,590	119,590
Lines of credit	100,000	85,000
Accounts payable and accrued expenses	45,435	52,299
Other liabilities	46,611	48,248
Total liabilities	1,675,944	1,678,146
Commitments and contingencies
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, 110,924,996 and 110,737,205 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	1,109	1,107
Paid-in capital	1,742,569	1,740,037
Accumulated other comprehensive deficit	(12,759)	(14,273)
Accumulated deficit	(231,369)	(235,064)
Total Extra Space Storage Inc. stockholders' equity	1,499,550	1,491,807
Noncontrolling interest represented by Preferred Operating Partnership units, net of $100,000 note receivable	29,964	29,918
Noncontrolling interests in Operating Partnership	22,603	22,492
Other noncontrolling interests	1,035	1,114
Total noncontrolling interests and equity	1,553,152	1,545,331
Total liabilities, noncontrolling interests and equity	$ 3,229,096	$ 3,223,477