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Equity Transactions (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended | 75 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 24, 2017 | Feb. 15, 2017 | Feb. 01, 2017 | Jun. 08, 2016 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Feb. 01, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock authorized to be repurchased (in shares) |  |  |  |  | 3,430,000 |  |  |  | 3,430,000 |  |  | 3,430,000 |
Remaining common stock authorized for repurchase (in shares) |  |  |  |  | 200,000 |  |  |  | 200,000 |  |  | 200,000 |
Repurchase of common shares (in shares) |  |  |  |  |  |  |  |  | 2,572,417 |  |  | 3,786,561 |
Cost of shares repurchased |  |  |  |  |  |  |  |  | $ 233,700 |  |  | $ 391,500 |
Weighted average price (in $ per share) |  |  |  |  |  |  |  |  |  |  |  | $ 103.38 |
Cash dividends declared (in $ per share) |  |  |  |  | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 1.8 | $ 1.8 | $ 1.35 |  |
Cash dividends declared |  |  |  |  |  |  |  |  | $ 13,015 | $ 16,009 | $ 12,451 |  |
Dividends payable |  |  |  |  | $ 3,479 |  |  |  | $ 3,479 | $ 4,233 |  | $ 3,479 |
Subsequent event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in $ per share) |  | $ 0.45 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from stock issuance |  |  | $ 207,100 |  |  |  |  |  |  |  |  |  |
Subsequent event [Member] | Common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  | 910,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from stock issuance |  |  | $ 207,100 |  |  |  |  |  |  |  |  |  |
Subsequent event [Member] | Common stock [Member] | Underwriters option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | 136,500 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from stock issuance | $ 14,300 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event [Member] | Common stock [Member] | Forecast [Member] | Underwriters option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) | 136,500 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event [Member] | Convertible preferred stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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) | $ 100 |  | $ 100.00 |  |  |  |  |  |  |  |  |  |
Preferred stock conversion, threshold consecutive trading days |  |  | 20 days |  |  |  |  |  |  |  |  |  |
Subsequent event [Member] | Convertible preferred stock [Member] | Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issuable upon conversion (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0.7576
Subsequent event [Member] | Convertible preferred stock [Member] | Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issuable upon conversion (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0.9091
Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  | $ 93.50 |  |  |  |
Repurchase Plan, Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common shares (in shares) |  |  |  | 556,516 |  |  |  |  |  |  |  |  |
Shares repurchased, percentage of common stock outstanding |  |  |  | 6.70% |  |  |  |  |  |  |  |  |

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