Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event - Additional Information (Detail)

v2.4.0.8
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