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Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Jan. 15, 2019 | Jan. 02, 2019 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends [Line Items] |  |  |  |  |  |  |
Common stock issued, discount rate |  |  |  |  | 3.00% |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 2.08 | $ 2.04 | $ 1.84
Dividends declared per common share outstanding (in usd per share) |  |  |  | $ 0.53 |  |  |
Distribution to limited partnership unitholders |  |  |  |  | $ 15,981 | $ 15,268 | $ 13,533
Dividend Income |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 1.61 | $ 1.7 | $ 1.75
Return on Invested Capital |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Return of capital (in usd per share) |  |  |  | $ 0.47 | 0.47 | 0.34 | 0.09
Series C Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  | 1.72 | $ 1.72 | $ 1.72
Series D Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  | $ 1.05 |  |
Subsequent Event |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock dividend paid | $ 12,000 |  |  |  |  |  |
Distribution to limited partnership unitholders | $ 4,100 |  |  |  |  |  |
Distributions partnership units (in usd per share) | $ 0.53 |  |  |  |  |  |
Preferred stock distributions |  | $ 3,000 |  |  |  |  |
Subsequent Event | Series C Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Dividends declared per preferred share outstanding (in usd per share) |  |  | $ 0.4297 |  |  |  |
Subsequent Event | Series D Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Dividends declared per preferred share outstanding (in usd per share) |  |  | $ 0.3828 |  |  |  |

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