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Equity - Narrative (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Jul. 21, 2016 shares | May 10, 2016 shares | Apr. 10, 2015 shares | Apr. 01, 2015 ft² shares | Jan. 20, 2015 USD ($) $ / shares shares | Jul. 31, 2016 shares | May 31, 2016 shares | Sep. 30, 2016 ft² building $ / shares shares | Sep. 30, 2015 ft² $ / shares | Mar. 31, 2015 $ / shares shares | Sep. 30, 2016 USD ($) ft² building $ / shares shares | Sep. 30, 2015 USD ($) ft² $ / shares | Dec. 31, 2015 ft² shares | Jan. 20, 2016 USD ($) | Dec. 10, 2015 $ / shares | Jan. 07, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units held by noncontrolling interests (in shares) |  |  |  |  |  |  |  | 26,983,719 |  |  | 26,983,719 |  | 56,296,315 |  |  |
Proceeds from sale of common stock (in shares) |  | 10,117,223 | 6,037,500 |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  |  |  |  |  | 820,587 | 483,862 |  | 820,587 | 483,862 |  |  |  |
Price per share (in dollars per share) | $ / shares |  |  |  |  | $ 31.75 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net | $ |  |  |  |  | $ 385,600,000 |  |  |  |  |  | $ 880,514,000 | $ 380,803,000 |  |  |  |
Stock repurchase program authorized | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Common dividends declared (in usd per share) | $ / shares |  |  |  |  |  |  |  | $ 0.2 | $ 0.125 |  | $ 0.6 | $ 0.375 |  |  |  |
At-the-Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 165,000 |  |  |  |  |
Proceeds from issuance of common stock, net | $ |  |  |  |  |  |  |  |  |  |  | $ 20,100,000 |  |  |  |  |
Maximum shares authorized, value | $ |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |
At-the-Market | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | 33.54 |  |  | $ 33.54 |  |  |  |  |
At-the-Market | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 33.95 |  |  | $ 33.95 |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of preferred stock (as a percent) |  |  |  |  |  |  |  |  |  | 8.375% | 8.375% |  |  |  |  |
Shares outstanding of preferred stock (in shares) |  |  |  |  |  |  |  |  |  | 5,800,000 |  |  |  |  |  |
Liquidation preference of preferred stock (dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  | $ 25.00 |
Par value of preferred stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |
Pinnacle JV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings in property | building |  |  |  |  |  |  |  | 2 |  |  | 2 |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  |  |  |  |  | 625,640 |  |  | 625,640 |  |  |  |  |
Ownership interest in property (as a percent) |  |  |  |  |  |  |  | 65.00% | 65.00% |  | 65.00% | 65.00% | 65.00% |  |  |
Canada Pension Plan Investment Board |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in property (as a percent) |  |  |  |  |  |  |  | 55.00% |  |  | 55.00% |  |  |  |  | 45.00%
EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  |  |  | 8,200,000 |  |  |  |  |  |  |  |  | 8,200,000 |  |  |
Consideration transferred, common units (in shares) |  |  |  | 63,474,791 |  |  |  |  |  |  |  |  |  |  |  |
Performance units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Public Offering, Exercise of Over-allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock (in shares) |  |  |  |  | 1,650,000 |  |  |  |  |  |  |  |  |  |  |
Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used for valuation of redemption (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Proceeds from sale of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 29,477,596 |  | 12,650,000 |  |  |
Number of shares redeemed during the period (in shares) | 19,000,000 |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |
Common Units | EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, common units (in shares) |  |  |  | 8,626,311 |  |  |  |  |  |  |  |  |  |  |  |
Common Units | Secondary Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares redeemed during the period (in shares) |  |  |  |  |  | 19,195,373 |  |  |  |  |  |  |  |  |  |
6.25% series A cumulative redeemable preferred units of the Operating Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of preferred stock (as a percent) |  |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |
Shares outstanding of preferred stock (in shares) |  |  |  |  |  |  |  | 407,066 |  |  | 407,066 |  |  |  |  |
Liquidation preference of preferred stock (dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 25 |  |  | $ 25 |  |  |  |  |
Preferred dividends declared (dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.3906 |  |  |  |  |  |  |  |

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