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Equity Transactions - Additional Information (Detail) - $ / shares |  |  | 3 Months Ended
--- | --- | --- | ---
May 01, 2018 | Feb. 14, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock cash dividends declared per share (in $ per share) |  | $ 0.45 | $ 0.45 | $ 0.45
Preferred stock cash dividends declared per share (in $ per share) |  |  | $ 1.8125 | $ 1.8125
Repurchases of common shares (in shares) |  |  | 0 |
Shares available for repurchase (in shares) |  |  | 883,756 |
Shares authorized for repurchase (in shares) |  |  | 4,180,045 |
Public offering 1 | Convertible preferred stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Convertible preferred stock dividend rate |  |  | 7.25% |
Subsequent Event |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Preferred stock cash dividends declared per share (in $ per share) | $ 1.8125 |  |  |

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