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Equity Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 15, 2018 | May 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common stock cash dividends declared per share (in $ per share) | $ 0.45 |  | $ 0.45 | $ 0.45 | $ 0.90 | $ 0.90
Preferred stock cash dividends declared per share (in $ per share) |  | $ 1.8125 | $ 1.81 | $ 1.81 | $ 3.63 | $ 3.63
Shares available for repurchase (in shares) |  |  | 823,134 |  | 823,134 |
Shares authorized for repurchase (in shares) |  |  | 4,180,045 |  | 4,180,045 |
Repurchases of common shares (in shares) |  |  |  |  | 60,622 |
Weighted average price (in dollars per share) |  |  |  |  | $ 123.69 |
Total cost of shares repurchased |  |  |  |  | $ 7.5 |
Public offering 1 | Convertible preferred stock |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Convertible preferred stock dividend rate |  |  |  |  | 7.25% |

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