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Equity Transactions - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2017 $ / shares | Aug. 16, 2017 $ / shares | Jun. 01, 2017 shares | Sep. 30, 2017 $ / shares shares | Sep. 30, 2016 $ / shares | Sep. 30, 2017 USD ($) day $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Feb. 01, 2020 shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Repurchases of common shares (in shares) |  |  |  |  |  | 66,244 |  |
Common stock cash dividends declared per share (in $ per share) | $ / shares |  | $ 0.45 |  | $ 0.45 | $ 0.45 | $ 1.35 | $ 1.35 |
Preferred stock cash dividends declared per share (in $ per share) | $ / shares |  |  |  | $ 1.81 | $ 0 | 5.4375 | $ 0 |
Weighted average price of shares repurchased (in dollars per share) | $ / shares |  |  |  |  |  | $ 113.21 |  |
Total cost of shares repurchased during the period | $ |  |  |  |  |  | $ 7,502 | $ 72,216 |
Shares available for repurchase (in shares) |  |  |  | 133,756 |  | 133,756 |  |
Shares authorized for repurchase (in shares) |  |  |  | 3,430,045 |  | 3,430,045 |  |
Convertible preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Convertible preferred stock liquidation preference (in dollars per share) | $ / shares |  |  |  | $ 100 |  | $ 100 |  |
Convertible preferred stock, threshold consecutive trading days | day |  |  |  |  |  | 20 |  |
Common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 1,260,169 |  |
Minimum | Forecast | Convertible preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) |  |  |  |  |  |  |  | 0.7576
Maximum | Forecast | Convertible preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Convertible preferred stock, shares issued upon conversion (in shares) |  |  |  |  |  |  |  | 0.9091
RidgeWorth |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Purchase price, shares issued (in shares) |  |  | 213,669 |  |  |  |  |
Public offering 1 |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from stock issuance | $ |  |  |  |  |  | $ 111,000 |  |
Public offering 1 | Convertible preferred stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 1,150,000 |  |
Convertible preferred stock dividend rate |  |  |  |  |  | 7.25% |  |
Public offering 2 |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from stock issuance | $ |  |  |  |  |  | $ 109,500 |  |
Public offering 2 | Common stock |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 1,046,500 |  |
Subsequent Event |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock cash dividends declared per share (in $ per share) | $ / shares | $ 1.8125 |  |  |  |  |  |  |

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