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Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 22, 2018 | Jan. 23, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Income attributable to noncontrolling interests |  |  | $ 12,505 | $ 12,411 | $ 11,441
Series D Cumulative Redeemable Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Depositary shares outstanding (in shares) |  | 3.0 |  |  |
Net proceeds from shares sold |  | $ 72,600 |  |  |
Liquidation preference (in usd per share) |  | $ 25.00 |  |  |
Annual dividend on depositary shares (in usd per share) |  | $ 1.53125 |  |  |
Percentage of redeemable preferred stock |  | 6.125% |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  | 1.00% |  |
Dividend rate on preferred stock |  |  | 6.125% |  |
Series C Cumulative Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Depositary shares outstanding (in shares) |  |  | 4.2 |  |
Liquidation preference (in usd per share) |  |  | $ 25.00 |  |
Annual dividend on depositary shares (in usd per share) |  |  | $ 1.71875 |  |
Percentage of redeemable preferred stock |  |  | 6.875% |  |
Stock redeemed during period (in shares) | 3.0 |  |  |  |
Depository shares to cumulative redeemable preferred stock ratio |  |  | 1.00% |  |
Dividend rate on preferred stock |  |  | 6.875% |  |

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