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Shareholders' Equity - Conversion of Series C Convertible Units into Class A Units (Details) - AH LLC - Series C Convertible Units | Dec. 31, 2016 shares | Feb. 28, 2016 shares | Dec. 31, 2015 shares
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Units owned (in shares) | 0 |  | 31,085,974
Operating Partnership |  |  |
Class of Stock [Line Items] |  |  |
Units owned (in shares) |  | 31,085,974 |
Business acquisition, equity interest issued or issuable, number of shares, multiplier |  | 1 |

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- Details
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