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Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Employee Stock Purchase Plan [Member]
H
Aug. 31, 2013
Employee Stock Purchase Plan [Member]
Jul. 31, 2013
Employee Stock Purchase Plan [Member]
Dec. 31, 2012
Employee Stock Purchase Plan [Member]
Aug. 31, 2012
Employee Stock Purchase Plan [Member]
Jul. 31, 2012
Employee Stock Purchase Plan [Member]
Dec. 31, 2011
Employee Stock Purchase Plan [Member]
Aug. 31, 2011
Employee Stock Purchase Plan [Member]
Jul. 31, 2011
Employee Stock Purchase Plan [Member]
Dec. 31, 2013
Performance Stock Plan [Member]
Dec. 31, 2012
Performance Stock Plan [Member]
Dec. 31, 2011
Performance Stock Plan [Member]
Dec. 31, 2009
Performance Stock Plan [Member]
Dec. 31, 2010
Performance Stock Plan [Member]
Jul. 31, 2009
Performance Stock Plan [Member]
Powell Brown [Member]
Dec. 31, 2012
Stock Incentive Plan [Member]
Jan. 31, 2012
Stock Incentive Plan [Member]
Jan. 31, 2011
Stock Incentive Plan [Member]
Dec. 31, 2013
Stock Incentive Plan [Member]
Dec. 31, 2012
Stock Incentive Plan [Member]
Dec. 31, 2011
Stock Incentive Plan [Member]
Dec. 31, 2010
Stock Incentive Plan [Member]
Apr. 28, 2010
Stock Incentive Plan [Member]
Apr. 28, 2010
Stock Incentive Plan [Member]
Maximum [Member]
Dec. 31, 2013
Stock Incentive Plan [Member]
Maximum [Member]
Apr. 28, 2010
Stock Incentive Plan [Member]
Minimum [Member]
Dec. 31, 2013
Stock Incentive Plan [Member]
Minimum [Member]
Dec. 31, 2011
Stock Incentive Plan [Member]
Decus [Member]
Dec. 31, 2010
Stock Incentive Plan [Member]
Decus [Member]
Dec. 31, 2012
Stock Incentive Plan [Member]
Arrowhead General Insurance Agency Superholding Corporation [Member]
Dec. 31, 2013
Incentive Stock Option Plan [Member]
Dec. 31, 2013
Incentive Stock Option Plan [Member]
Maximum [Member]
Apr. 21, 2000
Incentive Stock Option Plan [Member]
Maximum [Member]
Dec. 31, 2013
Incentive Stock Option Plan [Member]
Minimum [Member]
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                         5,549,882     187,040           3,719,974     187,040               814,545        
Initial stock prices, minimum                         $ 4.25                                                
Initial stock prices, maximum                         $ 25.68                                                
Shares not meeting first condition for vesting                         75,435 1,296,517 1,586,543   2,400,335   3,119,903     5,610,384 3,119,903 2,440,649 153,796                        
Shares met the first condition for vesting and awarded                         2,295,852 2,394,505 3,345,269   3,391,519   37,408     995,717 37,408 37,408 38,449                        
Shares distributed to the participants                         3,178,595                                                
Total fair market value of PSP grants                         $ 3,729,000 $ 23,034,000 $ 2,384,000                                            
Shares available for issuance under the SIP                                                   6,046,768                      
Vesting period, (in years)                                                     10 years   4 years           10 years   1 year
Expected term of options granted (in years)                                                       5 years   3 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 0 36,919 36,919                          
Shares granted to Board of Directors as part of their annual compensation                                            0                              
Number of granted shares vested                                           891,399                              
Shares available for future grants or for future subscription       1,246,838                                   2,207,098                              
Shares reserved for grants with PSP-type vesting conditions                                           318,134                              
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         $ 8.36     $ 5.84     $ 4.27                                                    
Issued shares of common stock           487,672     562,748     488,052                                                  
Aggregate purchase price of issued common stock       10,456,000     9,302,000     8,048,000                                                      
Aggregate purchase price per share of issued common stock       $ 21.44     $ 16.53     $ 16.49                                                      
Shares of common stock subscribed       222,526     246,164     230,481                                                   4,800,000  
Proceeds by participants       5,937,000     5,278,000     3,810,000                                                      
Pre-tax income annual percentage                                                                   15.00%      
ISOP expiry date                                                                   Dec. 31, 2008      
Accelerated vesting period (in years)                                                                     6 years   3 years
Options expire period (in years)                                                                   10 years      
Total intrinsic value of options exercised 1,558,000 5,780,000 333,000                                                                    
Unrecognized compensation expense $ 133,900,000                                                                        
Unrecognized compensation expense, weighted-average period (in years) 6 years 10 months 24 days