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Benefit Plans - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2010
Dec. 31, 2013
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2013
Performance-based RSUs [Member]
Dec. 31, 2013
Service-based RSUs [Member]
Dec. 31, 2013
Restricted Stock Units [Member]
Dec. 31, 2012
Restricted Stock Units [Member]
Dec. 31, 2011
Restricted Stock Units [Member]
Dec. 31, 2013
Common Stock [Member]
Jun. 06, 2007
Common Stock [Member]
Dec. 31, 2013
Vesting after three years [Member]
Performance-based RSUs [Member]
Dec. 31, 2013
Employee Stock Ownership and 401(k) Plans [Member]
Dec. 31, 2013
2007 Plan [Member]
Dec. 31, 2013
Minimum [Member]
Stock Options [Member]
Dec. 31, 2013
Minimum [Member]
Service-based RSUs [Member]
Dec. 31, 2013
Maximum [Member]
Stock Options [Member]
Dec. 31, 2013
Maximum [Member]
Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares of common stock remained available for grants of awards                             1,875,000              
Number of additional shares authorized   1,500,000   815,000   1,576,452                                
Reduction in common stock available for grant                                   2        
Minimum rate of exercise price granted                           100.00%                
Share-based compensation expense $ 3,680,000 $ 3,840,000 $ 5,221,000                                      
Tax benefit related to share-based compensation expense 1,400,000 1,500,000 2,000,000                                      
Capitalized share-based compensation expense 0 0 0                                      
Amount of reduction in net income due to share-based compensation expense 2,200,000 2,400,000 3,200,000                                      
Amount of reduction in diluted earning per share to share-based compensation expense $ 0.09 $ 0.09 $ 0.13                                      
Stock options granted           6,617,400                                
Stock options, exercise prices lower           $ 3.47                                
Stock options, exercise prices upper           $ 38.89                                
Purchase of shares           3,498,741                                
Stock option shares terminated           874,152                                
Stock option plans remain outstanding 1,772,062 2,838,553 3,086,019   3,344,450 1,772,062                                
Stock options vesting period           5 years     5 years                     1 year   2 years
Stock options expiration after grant date                                     7 years   10 years  
Options issued to non-employee advisors           0                                
Stock options outstanding, exercise prices lower           $ 15.29                                
Stock options outstanding, exercise prices upper           $ 38.89                                
Aggregate intrinsic value of options exercised and sold 21,300,000         14,100,000 4,900,000 4,200,000                            
Total unrecognized compensation cost           3,400,000                                
Expected recognition period of unrecognized compensation expense           1 year 8 months 12 days         2 years 8 months 12 days                      
Weighted average grant date fair value $ 9.87 $ 10.28 $ 9.68                                      
Percentage of vesting RSUs                               60.00%            
Percentage of vesting annually at anniversary                 20.00%                          
Number of RSU's expected to vest                 212,550 20,280                        
Number of forfeitures expected                   0 4,300    9,085                  
Total unrecognized compensation expense net of forfeitures                     4,700,000                      
Stock-based compensation expense for restricted stock                     2,000,000 1,800,000 2,600,000                  
Plan merged assets                                 16,400,000          
Dividends deducted                                 300,000          
Tax benefit from dividends                                 $ 100,000          
Shares outstanding, employee stock ownership plan                                 339,406          
Percentage of total common shares outstanding                                 2.00%