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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 07, 2020 | Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 300,000,000 | 300,000,000 |  |  |
Preferred stock, shares authorized (in shares) |  |  | 100,000,000 | 100,000,000 |  |  |
Preferred stock, shares issued (in shares) |  |  | 0 | 0 |  |  |
Preferred stock, shares outstanding (in shares) |  |  | 0 | 0 |  |  |
Issuance of common stock in public offering of common stock, shares (in shares) | 2,587,500 | 2,985,575 |  |  |  |  |
Issuance of common stock in public offering of common stock, net | $ 1,700,000,000 | $ 1,200,000,000 |  |  |  |  |
Dividends distributions |  |  | $ 936,269,000 | $ 825,893,000 | $ 727,448,000 |  |
Short term dividend payable |  |  | 10,873,000 | 9,029,000 |  |  |
Long term dividend payable |  |  | 7,947,000 | 7,108,000 |  |  |
Special Distribution |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Short term dividend payable |  |  | 10,900,000 | 9,000,000.0 |  |  |
Long term dividend payable |  |  | $ 7,900,000 | $ 7,100,000 |  |  |
2017 ATM Program |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock in public offering of common stock, shares (in shares) |  |  |  |  | 930,934 |  |
Issuance of common stock in public offering of common stock, net |  |  |  |  | $ 388,200,000 |  |
Sale of stock, equity offering agreement, authorized |  |  |  |  |  |  | $ 750,000,000.0
2018 ATM Program |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock in public offering of common stock, shares (in shares) |  |  | 415,512 | 903,555 |  |  |
Issuance of common stock in public offering of common stock, net |  |  | $ 298,300,000 | $ 447,500,000 |  |  |
Sale of stock, equity offering agreement, authorized |  |  | $ 750,000,000.0 |  |  |  |
2020 ATM Program |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Sale of stock, equity offering agreement, authorized |  |  |  |  |  | $ 1,500,000,000 |
Series A |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 25,000,000 |  |  |  |
Series A-1 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 25,000,000 |  |  |  |
Undesignated |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 50,000,000 |  |  |  |

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