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Stockholders' Equity - Additional Information (Detail) (USD $) | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jan. 31, 2014 Stock Repurchase Plan | Sep. 30, 2014 Stock Repurchase Plan | Dec. 31, 2013 Stock Repurchase Plan | Jun. 06, 2012 Stock Repurchase Plan
Stockholders Equity [Line Items] |  |  |  |  |  |
Board of Directors authorized stock repurchase program |  |  |  |  |  | $ 250,000,000
Number of shares that have been repurchased and retired during the period |  |  |  | 0 | 1,956,900 |
Average price per share |  |  |  |  | $ 36.35 |
Value of shares that have been repurchased and retired during the period |  |  |  |  | 71,100,000 |
Stock repurchase program, period |  |  |  | 2 years |  |
Payment for share repurchase | 4,367,000 | 48,769,000 | 4,400,000 |  | 66,700,000 |
Accrued liability related to repurchase of share |  |  |  | $ 0 | $ 4,400,000 |

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