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Contributions by the Sponsor (Details) (USD $) | 9 Months Ended | 0 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Feb. 28, 2013 Sponsor | Feb. 28, 2013 Sponsor Class B Common Shares | Feb. 28, 2013 Sponsor Operating Partnership property | Feb. 28, 2013 Operating Partnership Sponsor Series C Convertible Units
Significant Acquisitions and Disposals |  |  |  |  |  |
Number of properties |  |  |  |  | 2,770 |
Total consideration amount |  |  | $ 491,700,000 |  |  |
Units issue to Sponsor (in shares) |  |  |  |  |  | 31,085,974
Common shares issue to Sponsor |  |  |  | 634,408 |  |
Common shares issue to Sponsor per share |  |  |  | $ 15.50 |  |
Common units issue to Sponsor per unit |  |  |  |  |  | $ 15.50
Net book value reclassified from additional paid-in capital | 0 | 32,229,000 |  |  | 386,500,000 |
Units issue to Sponsor, value |  |  |  |  |  | 378,800,000
Units issue to Sponsor, value | $ 1,546,000 |  |  | $ 7,700,000 |  |

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