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Share Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 13, 2013
Two Thousand Ten Equity Compensation Plan [Member]
Dec. 31, 2012
Market Based Restricted Stock [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
Stock Options [Member]
Dec. 31, 2013
Minimum [Member]
Restricted Stock [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
Stock Options [Member]
Dec. 31, 2013
Maximum [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized to issue grants 26,963,150 26,963,150 26,963,150                
Increase in authorized number of shares of common stock       6,500,000              
Options available for grant under the Plans 6,837,714                    
Tax benefits recorded on stock based compensation $ 9.8 $ 6.8 $ 7.2                
Fair value of common stock to preferred stock, percentage           10.00%     25.00%    
Period of vesting provisions (in years)           1 year 1 year 1 year 6 years 6 years 4 years
Aggregate intrinsic value of options exercisable $ 260                    
Weighted average remaining contractual term of options exercisable (in years) 5 years 7 months 6 days                    
Weighted-average remaining contractual life for options outstanding (in years) 6 years 8 months 12 days 7 years 4 months 24 days                  
Shares, Granted 307,000 1,223,000 526,000   0