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Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 24 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Employee Stock Purchase Plan
H
Aug. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Aug. 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2010
Employee Stock Purchase Plan
Aug. 31, 2010
Employee Stock Purchase Plan
Dec. 31, 2012
Stock Incentive Plan
Jan. 31, 2012
Stock Incentive Plan
Jan. 31, 2011
Stock Incentive Plan
Apr. 28, 2010
Stock Incentive Plan
Y
Dec. 31, 2012
Stock Incentive Plan
Dec. 31, 2011
Stock Incentive Plan
Dec. 31, 2010
Stock Incentive Plan
Dec. 31, 2012
Stock Incentive Plan
Dec. 31, 2012
Stock Incentive Plan
Minimum
Dec. 31, 2012
Stock Incentive Plan
Maximum
Dec. 31, 2011
Stock Incentive Plan
Decus
Dec. 31, 2010
Stock Incentive Plan
Decus
Dec. 31, 2012
Stock Incentive Plan
Arrowhead General Insurance Agency Superholding Corporation
Dec. 31, 2012
Performance Stock Plan
Dec. 31, 2011
Performance Stock Plan
Dec. 31, 2010
Performance Stock Plan
Dec. 31, 2009
Performance Stock Plan
Jul. 31, 2009
Performance Stock Plan
Powell Brown
Dec. 31, 2012
Incentive Stock Option Plan
Y
Dec. 31, 2012
Incentive Stock Option Plan
Minimum
Dec. 31, 2012
Incentive Stock Option Plan
Maximum
Apr. 21, 2000
Incentive Stock Option Plan
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Maximum number of shares available to be granted under PSP                                             14,400,000                
Incremental increases in 20-trading-day average stock price                                             20.00%                
Number of years of continuous employment                                             15 years       20 years        
Attainment age                                             Attainment of age 64                
Grant of shares made under plan                               187,040           814,545 6,750,253     187,040          
Initial stock prices, minimum                                             $ 4.25                
Initial stock prices, maximum                                             $ 25.68                
Shares not meeting first condition for vesting                                             1,296,517                
Shares met the first condition for vesting and awarded 37,408                 37,408       37,408 37,408 38,449 37,408           2,394,505 3,345,269 3,391,519 4,423,436          
Shares distributed to the participants                                             3,059,231                
Weighted average grant-date fair value of PSP grants                           $ 22.59 $ 23.94 $ 12.62             $ 0.00 $ 0.00 $ 9.67            
Total fair market value of PSP grants                                             $ 23,034,000 $ 2,384,000 $ 31,965,000            
Shares available for issuance under the SIP                         6,046,768                                    
Vesting period, maximum (in years)                         10                             10      
Vesting period, minimum (in years)                         4                             1      
Expected term of options granted (in years)                                   3 years 5 years                        
Grants made to Decus employees under the SIP sub-plan                             2,375,892         24,670 5,205                    
Shares issued to Board of Directors as part of their annual compensation                   12,610 12,627 11,682         36,919                            
Shares available for future grants or for future subscription       1,734,510           4,455,517       4,455,517     4,455,517                            
Shares reserved for grants with PSP-type vesting conditions                   2,624,873       2,624,873     2,624,873                            
Shares available for issuance or authorized shares       12,000,000                                                      
Number of hours worked per week by employees       20                                                      
Maximum percentage of allotment through payroll deductions       10.00%                                                      
Allotted value, maximum, to purchase Company stock       25,000                                                      
Subscription Period, beginning       August 1                                                      
Subscription Period, ending       July 31                                                      
Stock price, percentage       85.00%                                                      
Quoted market price of Company's stock       15.00%                                                      
Value of a one-year stock option, percentage       85.00%                                                      
Fair value of an ESPP share option         $ 5.84   $ 4.27   $ 4.01                                            
Issued shares of common stock         562,748   488,052   500,334                                            
Aggregate purchase price of issued common stock       9,302,000   8,048,000   8,326,000                                              
Aggregate purchase price per share of issued common stock       $ 16.53   $ 16.49   $ 16.64                                              
Shares of common stock subscribed       246,164   230,481   206,201                                             4,800,000
Proceeds by participants       5,278,000   3,810,000   3,400,000                                              
Pre-tax income annual percentage                                                       15.00%      
ISOP expiry date                                                       Dec. 31, 2008      
Accelerated vesting period (in years)                                                         3 years 6 years  
Options expire period (in years)                                                       10 years      
Total intrinsic value of options exercised 5,780,000 333,000 2,344,000                                                        
Unrecognized compensation expense $ 68,000,000                                                            
Unrecognized compensation expense, weighted-average period (in years) 7 years 9 months 18 days