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Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Changes in equity |  |  |  |
Beginning Balance |  |  | $ 8,599,727 |
Net income attributable to common stockholders | 241,100 | (10,715) | 540,929 | 100,929
Cash flow hedge loss reclassified to earnings | 1,546 | 54,948 | 4,557 | 57,913
Noncontrolling interests income allocation |  |  | 14,221 |
Change in redemption value of redeemable noncontrolling interest |  |  | 4,088 |
Noncontrolling Interest, Decrease from Deconsolidation |  |  | 17,816 |
Noncontrolling interests derecognition |  |  | (17,816) |
Dividends declared to common stockholders |  |  | (455,531) |
Issuance of common stock, net of withholdings |  |  | 333,839 |
Amortization of deferred compensation |  |  | 21,268 |
Ending Balance | 9,045,282 |  | 9,045,282 |
Common stock |  |  |  |
Changes in equity |  |  |  |
Beginning Balance |  |  | 1,294 |
Issuance of common stock, net of withholdings |  |  | 26 |
Ending Balance | 1,320 |  | 1,320 |
Additional paid-in capital |  |  |  |
Changes in equity |  |  |  |
Beginning Balance |  |  | 8,988,723 |
Issuance of common stock, net of withholdings |  |  | 334,207 |
Amortization of deferred compensation |  |  | 21,268 |
Ending Balance | 9,344,198 |  | 9,344,198 |
Accumulated earnings less dividends |  |  |  |
Changes in equity |  |  |  |
Beginning Balance |  |  | (345,254) |
Net income attributable to common stockholders |  |  | 540,929 |
Change in redemption value of redeemable noncontrolling interest |  |  | 4,088 |
Dividends declared to common stockholders |  |  | (455,531) |
Issuance of common stock, net of withholdings |  |  | (394) |
Ending Balance | (256,162) |  | (256,162) |
Accumulated other comprehensive loss |  |  |  |
Changes in equity |  |  |  |
Beginning Balance |  |  | (48,631) |
Cash flow hedge loss reclassified to earnings |  |  | 4,557 |
Ending Balance | (44,074) |  | (44,074) |
Total AvalonBay stockholders' equity |  |  |  |
Changes in equity |  |  |  |
Beginning Balance |  |  | 8,596,132 |
Net income attributable to common stockholders |  |  | 540,929 |
Cash flow hedge loss reclassified to earnings |  |  | 4,557 |
Change in redemption value of redeemable noncontrolling interest |  |  | 4,088 |
Dividends declared to common stockholders |  |  | (455,531) |
Issuance of common stock, net of withholdings |  |  | 333,839 |
Amortization of deferred compensation |  |  | 21,268 |
Ending Balance | 9,045,282 |  | 9,045,282 |
Noncontrolling interests |  |  |  |
Changes in equity |  |  |  |
Beginning Balance |  |  | 3,595 |
Noncontrolling interests income allocation |  |  | 14,221 |
Ending Balance | $ 0 |  | $ 0 |

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