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Stockholders' Equity - Additional Information (Detail) (USD $)
 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Employees
Sep. 30, 2013
Stock Repurchase Plan
Jul. 25, 2012
Stock Repurchase Plan
Maximum
Sep. 30, 2013
New Stock Repurchase Plan
Sep. 06, 2013
New Stock Repurchase Plan
Maximum
Oct. 31, 2013
Dividend Declared
Subsequent Event
Stockholders Equity Note [Line Items]              
Dividend declaration date             Oct. 23, 2013
Dividend per share, declared             $ 0.05
Dividend payment date             Dec. 31, 2013
Dividend record date             Dec. 17, 2013
Amount approved for repurchases under stock buyback program       $ 150,000,000   $ 200,000,000  
Treasury stock acquired, Values 85,733,000 22,100,000 51,100,000   12,500,000    
Treasury stock acquired, Shares   947,926 2,567,266   601,668    
Remaining Amount approved for repurchases under stock buyback program         $ 188,000,000