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Capital - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 23, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Gross proceeds from sale of shares |  | $ 0 | $ 611,278 | $ 621,800
Shares and Units [Abstract] |  |  |  |
OP units outstanding (in shares) |  | 300,416,821 |  |
OP units owned by the Company (in shares) |  | 159,427,448 |  |
OP units owned by the Company (as a percent) |  | 53.10% |  |
OP units not owned by the Company (in shares) |  | 140,989,373 |  |
OP units not owned by the Company (as a percent) |  | 46.90% |  |
Dividends on common stock received until performance criteria met for LTIP units (as a percent) |  | 10.00% |  |
Dividends on common stock received after performance criteria met for LTIP units (as a percent) |  | 90.00% |  |
Dividends on common stock received in periods after performance criteria met for LTIP units (as a percent) |  | 100.00% |  |
Series PR operating partnership units |  |  |  |
Shares and Units [Abstract] |  |  |  |
OP units not owned by the Company (in shares) |  | 93,203,688 |  | 93,075,441
Common shares | Common class A shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares (in shares) |  |  |  | 29,610,854
Common shares issued (in dollars per share) |  |  |  | $ 21.00
General partner | Series PR operating partnership units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of common shares (in shares) | 29,610,854 |  |  | 29,610,854
QIA |  |  |  |
Class of Stock [Line Items] |  |  |  |
Economic interest held by QIA | 9.90% |  |  |

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