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Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 | Jan. 13, 2017 | Jan. 06, 2017 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividends [Line Items] |  |  |  |  |  |  |
Common stock issued, discount rate |  |  |  |  | 3.00% |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 1.84 | $ 1.69 | $ 1.56
Dividends declared per common share outstanding (in usd per share) |  |  |  | $ 0.51 |  |  |
Distribution to limited partnership unitholders |  |  |  |  | $ 13,533 | $ 12,228 | $ 11,117
Dividend Income |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 1.75 | $ 1.69 | $ 1.56
Return on Invested Capital |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Return of capital (in USD per share) |  |  |  | $ 0.09 | 0.09 |  |
Series A Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  |  |  | 2.41
Series C Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  | $ 1.72 | $ 1.72 | $ 1.72
Subsequent Event |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock dividend paid | $ 11,000 |  |  |  |  |  |
Distribution to limited partnership unitholders | $ 3,800 |  |  |  |  |  |
Distributions partnership units (in usd per share) | $ 0.51 |  |  |  |  |  |
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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