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Stockholders' Equity - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jan. 31, 2014
Stock Repurchase Plan
Jun. 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
Stock repurchase unused balance amount       128,800,000    
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 28,758,000 4,400,000   66,700,000  
Accrued liability related to repurchase of share       $ 0 $ 4,400,000