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Shareholder Equity and Non Controlling Interests - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |  |  | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | May 14, 2014 | Oct. 29, 2013 | Jul. 21, 2014 Underwritten public offering | Jan. 29, 2014 Underwritten public offering | Jul. 21, 2014 Underwritten public offering | Jan. 29, 2014 Underwritten public offering | May 07, 2014 Noncontrolling Interest Carrington | Aug. 28, 2014 Noncontrolling Interest Walnut Hill
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Public offering |  |  |  |  | 8,050,000 | 8,050,000 |  |  |  |
Share price |  |  | $ 8.95 | $ 8.60 |  |  | $ 9.50 | $ 8.30 |  |
Proceeds from issuance of common stock, gross |  |  |  |  | $ 76,475 | $ 66,815 |  |  |  |
Proceeds from issuance of common stock, net | 134,881 | 31,461 |  |  | 72,002 | 62,718 |  |  |  |
Number of limited units issued |  |  |  |  |  |  |  |  | 222,062 | 137,361
Limited units issued value |  |  |  |  |  |  |  |  | $ 1,986 | $ 1,377

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