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Shareholders' Equity - Additional Information (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 24, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 14, 2018 | Jan. 01, 2013
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, voting rights |  | one vote per share |  |  |  |
Minimum % of REIT taxable income to be paid as dividend annually |  | 90.00% |  |  |  | 90.00%
Purchase of treasury shares |  | $ 9,771,000 |  | $ 95,175,000 |  |
Preferred stock, shares authorized (in shares) |  | 30,000,000 | 30,000,000 |  |  |
Preferred stock, shares outstanding (in shares) |  | 0 | 0 |  |  |
Life term of contract | 5 years |  |  |  |  |
SACS |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Life term of contract |  | 25 years |  |  |  |
Percentage of Profit Share of Parent in Joint Venture |  | 88.75% |  |  |  |
Percentage of Profit Share of Noncontrolling in Joint Venture |  | 11.25% |  |  |  |
Amended Credit Agreement |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 100,000,000.0 |  |  |  |
Amended Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 900,000,000 |
Common Stock | February2018 Stock Buy Back Program |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 200,000,000 |
Purchase of treasury share |  | 553,665 | 0 | 4,210,254 |  |
Purchase of treasury shares |  | $ 9,000,000.0 | $ 0 | $ 95,200,000 |  |

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