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Earnings Per Share - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended | 0 Months Ended |  | 0 Months Ended | 6 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 14, 2014 | Feb. 25, 2014 | Sep. 30, 2014 Common Stock | Feb. 03, 2014 Merrill Lynch Accelerated Share Repurchase Agreement | Sep. 30, 2014 Merrill Lynch Accelerated Share Repurchase Agreement | Feb. 03, 2014 Merrill Lynch Accelerated Share Repurchase Agreement tranche | Feb. 03, 2014 Merrill Lynch Accelerated Share Repurchase Agreement Initial Delivery | Feb. 03, 2014 Merrill Lynch Accelerated Share Repurchase Agreement Fair Market Value | Apr. 30, 2014 Merrill Lynch Accelerated Share Repurchase Agreement Final Settlement | Sep. 30, 2014 Merrill Lynch Accelerated Share Repurchase Agreement Total | Apr. 30, 2014 JP Morgan Accelerated Share Repurchase Agreement | Apr. 30, 2014 JP Morgan Accelerated Share Repurchase Agreement tranche | May 01, 2014 JP Morgan Accelerated Share Repurchase Agreement Initial Delivery | May 01, 2014 JP Morgan Accelerated Share Repurchase Agreement Fair Market Value | Jul. 15, 2014 JP Morgan Accelerated Share Repurchase Agreement Final Settlement | Oct. 14, 2014 Subsequent Event
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations Attributable to Parent | $ 79,473,000 | $ 89,981,000 | $ 220,297,000 | $ 252,244,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in dividend rate, percentage |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend, amount per share (in dollars per share) |  |  |  |  | $ 0.275 | $ 0.275 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.275
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  | 100,000,000 |  |  |  |  |
Number of tranches |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 2 |  |  |  |
Authorized amount per tranche purchased |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Payment for repurchase of common stock |  |  | 150,000,000 | 582,298,000 |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  | 100,000,000 |  |  |
Repurchase of common stock shares (in shares) |  |  |  |  |  |  |  |  |  |  | 623,248 |  | 150,504 | 773,752 |  |  | 1,193,317 |  | 223,000 |
Share price minimum for repurchase agreement transaction (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.50 |  |  |  |
Shares repurchased |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  | $ 80,000,000 |  |
Forward Purchase Price adjustment amount (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.77 |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  |  | 1,967,069 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for repurchase (in shares) | 3,972,525 |  | 3,972,525 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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