Noncontrolling Interests In Operating Partnership and Other Noncontrolling Interests - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2024	Mar. 31, 2026 USD ($) store joint_venture $ / shares shares	Dec. 31, 2025 USD ($)
Noncontrolling Interest [Line Items]
Note receivable interest rate	10.00%
Period used as a denomination to determine the average closing price of common stock		10 days
Ten day average closing stock price (in dollars per share) \| $ / shares		$ 131.31
Preferred units outstanding (in shares) \| shares		9,421,211
Consideration to be paid on redemption of common OP units \| $		$ 1,237,099
Number of consolidated joint ventures \| joint_venture		12
Total number of stores in consolidated joint venture \| store		16
Number of joint ventures operating store \| joint_venture		12
Number of joint ventures with property under development \| store		4
Operating Partnership
Noncontrolling Interest [Line Items]
Loan receivable, reduction of noncontrolling interests \| $		$ 50,000	$ 50,000
Common Stock
Noncontrolling Interest [Line Items]
Unit conversion ratio		1
Operating Partnership
Noncontrolling Interest [Line Items]
Ownership interest held		95.60%
Ownership interest held by joint venture partner		4.40%
Other noncontrolling interests \| Maximum
Noncontrolling Interest [Line Items]
Ownership interest held by joint venture partner		25.00%

Extra Space Storage Inc. 10-Q