Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets:
Real estate assets, net	$ 3,027,654	$ 2,991,722
Investments in unconsolidated real estate ventures	101,698	106,313
Cash and cash equivalents	206,932	30,785
Restricted cash	20,502	16,976
Receivables from related parties and affiliated real estate joint ventures	3,258	11,078
Other assets, net	72,572	66,603
Total assets	3,432,616	3,223,477
Liabilities, Noncontrolling Interests and Equity:
Notes payable	1,409,982	1,369,690
Premium on notes payable	2,546	3,319
Exchangeable senior notes	250,000
Discount on exchangeable senior notes	(18,133)
Notes payable to trusts	119,590	119,590
Lines of credit		85,000
Accounts payable and accrued expenses	46,982	52,299
Other liabilities	31,858	48,248
Total liabilities	1,842,825	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, 111,223,460 and 110,737,205 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	1,112	1,107
Paid-in capital	1,765,577	1,740,037
Accumulated other comprehensive income (deficit)	5,108	(14,273)
Accumulated deficit	(241,391)	(235,064)
Total Extra Space Storage Inc. stockholders' equity	1,530,406	1,491,807
Noncontrolling interest represented by Preferred Operating Partnership units, net of $100,000 note receivable	30,033	29,918
Noncontrolling interests in Operating Partnership	28,877	22,492
Other noncontrolling interests	475	1,114
Total noncontrolling interests and equity	1,589,791	1,545,331
Total liabilities, noncontrolling interests and equity	$ 3,432,616	$ 3,223,477