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Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,193 | $ 11,194 | $ 12,390
Common Stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 50,963 | 49,383 | 48,568
Limited Partnership Unitholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,821 | $ 16,751 | $ 16,642
Common stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 293,615,000 | 228,498,000 | 430,462,000
Limited Partnership Units Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 61,009,000 | 51,579,000 | 60,936,000
4th Quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders | $ 2,798 |  |  |  | $ 2,798 |  |  |  | $ 3,531 |  |  |  |  |  |
Common Stockholders | 13,037 |  |  |  | 12,371 |  |  |  | 12,251 |  |  |  |  |  |
Limited Partnership Unitholders | $ 4,702 |  |  |  | $ 4,195 |  |  |  | $ 4,173 |  |  |  |  |  |
Common stock shares issued | 63,970,000 |  |  |  | 117,368,000 |  |  |  | 104,558,000 |  |  |  |  |  |
Discounted Share Price (in usd per share) | $ 45.46 |  |  |  | $ 24.08 |  |  |  | $ 52.84 |  |  |  | $ 45.46 | $ 24.08 | $ 52.84
Limited Partnership Units Issued (in shares) | 13,697,000 |  |  |  | 23,370,000 |  |  |  | 13,747,000 |  |  |  |  |  |
Average Unit Price (in usd per share) | $ 45.95 |  |  |  | $ 24.35 |  |  |  | $ 53.73 |  |  |  | $ 45.95 | $ 24.35 | $ 53.73
3rd Quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  | $ 2,798 |  |  |  | $ 2,798 |  |  |  | $ 2,953 |  |  |  |  |
Common Stockholders |  | 12,999 |  |  |  | 12,373 |  |  |  | 12,195 |  |  |  |  |
Limited Partnership Unitholders |  | $ 4,694 |  |  |  | $ 4,188 |  |  |  | $ 4,166 |  |  |  |  |
Common stock shares issued |  | 65,171,000 |  |  |  | 14,525,000 |  |  |  | 105,753,000 |  |  |  |  |
Discounted Share Price (in usd per share) |  | $ 44.44 |  |  |  | $ 28.98 |  |  |  | $ 53.66 |  |  |  |  |
Limited Partnership Units Issued (in shares) |  | 13,841,000 |  |  |  | 13,108,000 |  |  |  | 13,406,000 |  |  |  |  |
Average Unit Price (in usd per share) |  | $ 44.92 |  |  |  | $ 29.47 |  |  |  | $ 54.56 |  |  |  |  |
2nd Quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  | $ 2,798 |  |  |  | $ 2,799 |  |  |  | $ 2,953 |  |  |  |
Common Stockholders |  |  | 12,488 |  |  |  | 12,364 |  |  |  | 12,116 |  |  |  |
Limited Partnership Unitholders |  |  | $ 4,218 |  |  |  | $ 4,188 |  |  |  | $ 4,155 |  |  |  |
Common stock shares issued |  |  | 68,206,000 |  |  |  | 12,627,000 |  |  |  | 99,804,000 |  |  |  |
Discounted Share Price (in usd per share) |  |  | $ 41.87 |  |  |  | $ 32.22 |  |  |  | $ 51.38 |  |  |  |
Limited Partnership Units Issued (in shares) |  |  | 13,978,000 |  |  |  | 0 |  |  |  | 20,041,000 |  |  |  |
Average Unit Price (in usd per share) |  |  | $ 42.33 |  |  |  | $ 0 |  |  |  | $ 51.99 |  |  |  |
1st Quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stockholders |  |  |  | $ 2,799 |  |  |  | $ 2,799 |  |  |  | $ 2,953 |  |  |
Common Stockholders |  |  |  | 12,439 |  |  |  | 12,275 |  |  |  | 12,006 |  |  |
Limited Partnership Unitholders |  |  |  | $ 4,207 |  |  |  | $ 4,180 |  |  |  | $ 4,148 |  |  |
Common stock shares issued |  |  |  | 96,268,000 |  |  |  | 83,978,000 |  |  |  | 120,347,000 |  |  |
Discounted Share Price (in usd per share) |  |  |  | $ 29.50 |  |  |  | $ 48.59 |  |  |  | $ 51.28 |  |  |
Limited Partnership Units Issued (in shares) |  |  |  | 19,493,000 |  |  |  | 15,101,000 |  |  |  | 13,742,000 |  |  |
Average Unit Price (in usd per share) |  |  |  | $ 29.83 |  |  |  | $ 49.40 |  |  |  | $ 52.16 |  |  |

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