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Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Nov. 30, 2009
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Stockholders Equity [Line Items]          
Board of Directors authorized stock repurchase program $ 500,000,000        
Number of shares that have been repurchased and retired during the period       5,733,205  
Value of shares that have been repurchased and retired during the period   71,130,000 50,032,000 209,400,000  
Stock repurchase remaining authorized, paid   66,763,000 50,032,000 209,400,000  
Accelerated stock buyback         209,400,000
Reduction in common stock and additional paid-in capital       209,400,000  
Stock Repurchase Plan
          
Stockholders Equity [Line Items]          
Board of Directors authorized stock repurchase program   250,000,000      
Stock repurchase remaining authorized amount   128,800,000      
Number of shares that have been repurchased and retired during the period   1,956,900 1,681,029    
Average price per share   $ 36.35 $ 29.76    
Value of shares that have been repurchased and retired during the period   71,100,000 50,000,000    
Stock repurchase program, period   2 years      
Stock repurchase remaining authorized, paid   66,700,000      
Stock repurchase remaining authorized, accrued   $ 4,400,000