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Acquisitions and Dispositions Acquisitions and Dispositions - Management Internalization (Details 2) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 10, 2013 | Dec. 31, 2014 | Dec. 31, 2015 | Nov. 30, 2012
Business Acquisition [Line Items] |  |  |  |
Issuance of Class A units |  | $ 11,179 |  |
Estimated fair values of the net assets |  |  |  |
Goodwill |  | $ 120,655 | $ 120,655 |
Management Internalization |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired of membership interests | 100.00% |  |  |
Monthly maintenance fee | $ 100 |  |  |
Estimated fair values of the net assets |  |  |  |
Buildings and improvements | 4,214 |  |  |
Goodwill | 120,655 |  |  |
Estimated fair value of assets and liabilities acquired | 130,069 |  |  |
Net monetary assets of subsidiary | 7,000 |  |  |
Cash and cash equivalents | 9,000 |  |  |
Trademark | Management Internalization |  |  |  |
Estimated fair values of the net assets |  |  |  |
Identified intangible assets | 3,100 |  |  |
Database | Management Internalization |  |  |  |
Estimated fair values of the net assets |  |  |  |
Identified intangible assets | $ 2,100 |  |  |
Series D Convertible Units | Operating Partnership |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Issuance of units (in shares) | 4,375,000 |  |  |
Series E Convertible Units | Operating Partnership |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Units owned (in shares) |  | 4,375,000 |  |
AH LLC | Series D Convertible Units |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Units owned (in shares) |  | 4,375,000 | 4,375,000 |
AH LLC | Series D Convertible Units | Operating Partnership |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Units owned (in shares) |  | 4,375,000 | 4,375,000 |
AH LLC | Series D Convertible Units | Operating Partnership | Management Internalization |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Issuance of Class A units | $ 65,200 |  |  |
AH LLC | Series E Convertible Units |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Units owned (in shares) |  | 4,375,000 | 4,375,000 |
AH LLC | Series E Convertible Units | Operating Partnership |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Units owned (in shares) | 4,375,000 | 4,375,000 |  |
AH LLC | Series E Convertible Units | Operating Partnership | Management Internalization |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Issuance of Class A units | $ 64,900 |  |  |
Minimum | Management Internalization |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Right to receive percentage of promoted interests in future outside investment vehicles | 20.00% |  |  |
Maximum | Management Internalization |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Right to receive percentage of promoted interests in future outside investment vehicles | 100.00% |  |  |
Agreement on Investment Opportunities | AH LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition and renovation fee in percent | 5.00% |  |  | 5.00%

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