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Shareholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jul. 21, 2014
Maximum [Member]
Sep. 30, 2014
Accelerated Share Repurchase Agreement [Member]
Sep. 02, 2014
Accelerated Share Repurchase Agreement [Member]
Oct. 08, 2014
Subsequent Event [Member]
Accelerated Share Repurchase Agreement [Member]
Equity, Class of Treasury Stock [Line Items]              
Shares repurchased, authorized amount   $ 25,000,000   $ 200,000,000      
Shares repurchased, aggregate repurchase amount           50,000,000  
Shares repurchased, remaining amount         7,500,000    
Shares repurchased, number of shares received initially 2,139,000   0     1,293,760  
Fair value of common stock repurchased $ 67,525,000         $ 42,500,000  
Total number of shares repurchased             1,539,760