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Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Jan. 15, 2020 | Jan. 02, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends [Line Items] |  |  |  |  |  |  |
Common stock issued, discount rate |  |  |  |  | 3.00% |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 2.12 | $ 2.12 | $ 2.08
Dividends declared per common share outstanding (in usd per share) |  |  |  | $ 0.53 |  |  |
Common stock dividend paid | $ 12,400 |  |  |  |  |  |
Distribution to limited partnership unitholders | $ 4,200 |  |  |  | $ 16,751 | $ 16,642 | $ 15,981
Distributions partnership units (in usd per share) | $ 0.53 |  |  |  |  |  |
Preferred stock distributions |  | $ 2,800 |  |  |  |  |
Dividend Income |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Common stock distributions (in usd per share) |  |  |  |  | $ 1.43 | $ 2.00 | $ 1.61
Return on Invested Capital |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Return of capital (in usd per share) |  |  |  | $ 0.69 | 0.69 | 0.12 | 0.47
Series C Preferred Stock |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  |  | 1.80 | 1.72
Depositary Shares each representing 1/100th of a share of 6.125% Series D Cumulative Redeemable Preferred Stock, Par Value $0.01 Per Share |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  | 1.53 | 1.53 | $ 1.05
Dividends declared per preferred share outstanding (in usd per share) |  |  | $ 0.3828 |  |  |  |
Depositary Shares each representing 1/100th of a share of 6.000% Series E Cumulative Redeemable Preferred Stock, Par Value $0.01 Per Share |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |
Preferred stock dividend (in usd per share) |  |  |  |  | $ 1.50 | $ 0.06 |
Dividends declared per preferred share outstanding (in usd per share) |  |  | $ 0.3750 |  |  |  |

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