| Subsequent Event - Additional Information (Detail) (USD $) | Sep. 11, 2014
 2014 Share Repurchase Program [Member]
 Subsequent Event [Member]
 Maximum [Member] | Aug. 03, 2013
 2013 Share Repurchase Program [Member]
 Maximum [Member] | Sep. 11, 2014
 2013 Share Repurchase Program [Member]
 Subsequent Event [Member] | 
|---|---|---|---|
| Subsequent Event [Line Items] | |||
| Repurchase of common stock authorized amount | $ 300,000,000 | $ 150,000,000 | |
| Shares authorized but unused amount revoked | $ 112,664,000 | 
| X | ||||||||||
| 
- Definition Amount of stock repurchase plan authorized. No definition available. 
 | 
| X | ||||||||||
| 
- Definition Amount remaining of a stock repurchase plan authorized. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
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