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Equity Transactions (Detail) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended | 87 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2018 USD ($) $ / shares | Feb. 01, 2018 USD ($) | Feb. 01, 2017 USD ($) day $ / shares shares | Jun. 08, 2016 shares | Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2017 $ / shares | Jun. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Feb. 01, 2020 $ / shares shares | Feb. 24, 2017 $ / shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock authorized to be repurchased (in shares) |  |  |  |  | 4,200,000 |  |  |  | 4,200,000 |  |  | 4,200,000 |  |
Remaining common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  |  |  | 883,756 |  |  |  |
Repurchase of common shares (in shares) |  |  |  |  |  |  |  |  | 66,244 |  |  | 3,852,805 |  |
Cost of shares repurchased | $ |  |  |  |  |  |  |  |  | $ 7,500 |  |  | $ 399,000 |  |
Weighted average price (in $ per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 103.55 |  |
Stock issued (in shares) |  |  |  |  |  |  |  |  | 1,260,169 |  |  |  |  |
Cash dividends declared per common share (in $ per share) | $ / shares |  |  |  |  | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 1.80 | $ 1.8 | $ 1.8 |  |  |
Cash dividends declared | $ |  |  |  |  |  |  |  |  | $ 13,545 | $ 13,015 | $ 16,009 |  |  |
Cash dividends declared per preferred share (in $ per share) | $ / shares |  |  |  |  | $ 1.8125 | $ 1.8125 | $ 1.8125 | $ 1.8125 | $ 7.25 | $ 0 | $ 0 |  |  |
Cash dividends declared. preferred | $ |  |  |  |  |  |  |  |  | $ 8,337 |  |  |  |  |
Dividends payable | $ |  |  |  |  | $ 6,528 |  |  |  | $ 6,528 | $ 3,479 |  | $ 6,528 |  |
Convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  | 1,150,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate |  |  | 7.25% |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference (in $ per share) | $ / shares |  |  | $ 100.00 |  |  |  |  |  |  |  |  |  |  | $ 100
Preferred stock conversion, threshold consecutive trading days | day |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock | Forecast | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issuable upon conversion (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0.7576 |
Conversion price of stock (USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 110 |
Convertible preferred stock | Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issuable upon conversion (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0.9091 |
Conversion price of stock (USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 132 |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from stock issuance | $ |  |  | $ 111,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in $ per share) | $ / shares | $ 0.45 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | $ | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per preferred share (in $ per share) | $ / shares | $ 1.8125 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared. preferred | $ |  | $ 2,100 |  |  |  |  |  |  |  |  |  |  |  |
Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common shares (in shares) |  |  |  |  |  |  |  |  |  | 1,727,746 |  |  |  |
Cost of shares repurchased | $ |  |  |  |  |  |  |  |  |  | $ 161,500 |  |  |  |
Weighted average price (in $ per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 93.50 |  |  |  |
Repurchase Plan, Tender Offer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common shares (in shares) |  |  |  | 556,516 |  |  |  |  |  |  |  |  |  |
Shares repurchased, percentage of common stock outstanding |  |  |  | 6.70% |  |  |  |  |  |  |  |  |  |
Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  |  |  |  | 1,046,500 |  |  |  |  |
Proceeds received on sale of stock | $ |  |  |  |  |  |  |  |  | $ 109,500 |  |  |  |  |
RidgeWorth |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  |  |  |  | 213,669 |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared | $ |  |  |  |  |  |  |  |  | $ 13,545 | $ 13,015 | $ 16,009 |  |  |

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