Fair Value Measurements - Summary of Fair Value for Interest Rate Options (Details) - Fair value recurring - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Interest rate swaps - pay-fixed, receive-floating
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	$ (37,561)	$ 14,679
Interest rate swaps - pay-fixed, receive-floating \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate swaps - pay-fixed, receive-floating \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	(37,561)	14,679
Interest rate swaps - pay-fixed, receive-floating \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate swaps - pay-floating, receive-fixed
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	465
Interest rate swaps - pay-floating, receive-fixed \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate swaps - pay-floating, receive-fixed \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	465
Interest rate swaps - pay-floating, receive-fixed \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate caps, net
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	1,308	0
Interest rate caps, net \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate caps, net \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	1,308	0
Interest rate caps, net \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate swaps - forward starting
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	331
Interest rate swaps - forward starting \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	0
Interest rate swaps - forward starting \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	331
Interest rate swaps - forward starting \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	0	$ 0
Interest rate caps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	6,700
Sold Interest Rate Caps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Fair Value	$ (5,400)

Apartment Income REIT, L.P. 10-Q