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Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 29, 2016 | Jan. 15, 2016 | Jan. 07, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Dividends [Line Items] |  |  |  |  |  |  |
Common stock issued, discount rate |  |  |  |  | 3.00% |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 1.69 | $ 1.56 | $ 1.44
Dividends declared per common share outstanding (in usd per share) |  |  |  | $ 0.43 |  |  |
Distribution to limited partnership unitholders |  |  |  |  | $ 12,228 | $ 11,117 | $ 9,956
Dividend Income |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 1.69 | $ 1.56 | $ 0.96
Return on Invested Capital |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock distributions (in usd per share) |  |  |  |  |  |  | 0.48
Series A Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  |  | 2.41 | 2.00
Series B Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  |  |  | 0.99
Series C Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  | $ 1.72 | $ 1.72 | $ 1.09
Subsequent Event |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock dividend paid | $ 9,100 |  |  |  |  |  |
Distribution to limited partnership unitholders | $ 3,100 |  |  |  |  |  |
Distribution to limited partnership unitholders (in usd per share) | $ 0.43 |  |  |  |  |  |
Subsequent Event | Series C Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Dividends declared per preferred share outstanding (in usd per share) |  |  | $ 0.4297 |  |  |  |
Preferred stock distributions |  | $ 3,100 |  |  |  |  |

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