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Common Stock - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Special Cash Dividend
Dec. 31, 2013
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Dec. 31, 2013
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Dec. 31, 2013
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2013
2001 Employees' Restricted Stock Purchase Plan
Dec. 31, 2012
2001 Employees' Restricted Stock Purchase Plan
Dec. 31, 2011
2001 Employees' Restricted Stock Purchase Plan
Dec. 31, 2010
2001 Employees' Restricted Stock Purchase Plan
Dec. 31, 2011
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
Fourth quarter of 2007 Issuance
Dec. 31, 2010
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
Fourth quarter of 2007 Issuance
Dec. 31, 2009
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
Fourth quarter of 2007 Issuance
Dec. 31, 2008
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
Fourth quarter of 2007 Issuance
Dec. 31, 2007
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
Fourth quarter of 2007 Issuance
Dec. 31, 2013
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2009 Issuance
Dec. 31, 2012
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2009 Issuance
Dec. 31, 2011
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2009 Issuance
Dec. 31, 2010
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2009 Issuance
Dec. 31, 2009
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2009 Issuance
Mar. 31, 2009
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2009 Issuance
Dec. 31, 2012
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2008 Issuance
Dec. 31, 2011
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2008 Issuance
Dec. 31, 2010
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2008 Issuance
Dec. 31, 2009
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2008 Issuance
Mar. 31, 2008
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer
First Quarter of 2008 Issuance
Dec. 31, 2012
2001 Employees' Restricted Stock Purchase Plan
Various Employees
Dec. 31, 2011
2001 Employees' Restricted Stock Purchase Plan
Various Employees
Dec. 31, 2007
2001 Employees' Restricted Stock Purchase Plan
Various Employees
Dec. 31, 2013
2005 Employees' Restricted Stock Purchase Plan
Dec. 31, 2012
2005 Employees' Restricted Stock Purchase Plan
Dec. 31, 2011
2005 Employees' Restricted Stock Purchase Plan
Dec. 31, 2013
Long Term Incentive Plans
Dec. 31, 2012
Long Term Incentive Plans
Dec. 31, 2011
Long Term Incentive Plans
Dec. 31, 2013
Stock Incentive Plan
Dec. 31, 2012
Stock Incentive Plan
Dec. 31, 2011
Stock Incentive Plan
Dec. 31, 2013
Class B
Dec. 31, 2010
Class B
2001 Employees' Restricted Stock Purchase Plan
Dec. 31, 2013
Class B
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Dec. 31, 2012
Class B
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Dec. 31, 2011
Class B
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Dec. 31, 2010
Class B
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Mar. 31, 2010
Class B
2001 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Dec. 31, 2013
Class B
Stock Incentive Plan
Dec. 31, 2013
Class B
2010 Employees' Restricted Stock Purchase Plan
Dec. 31, 2013
Class B
2010 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Dec. 31, 2012
Class B
2010 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Dec. 31, 2012
Class B
2010 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
First Anniversary
Dec. 31, 2012
Class B
2010 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Second Anniversary
Dec. 31, 2012
Class B
2010 Employees' Restricted Stock Purchase Plan
Chief Executive Officer ("CEO") And Chairman Of The Board
Third Anniversary
Dec. 31, 2013
Class B
2010 Employees' Restricted Stock Purchase Plan
Various Employees
Dec. 31, 2012
Class B
2010 Employees' Restricted Stock Purchase Plan
Various Employees
Dec. 31, 2011
Class B
2010 Employees' Restricted Stock Purchase Plan
Various Employees
Dec. 31, 2013
Class B
2010 Employees' Restricted Stock Purchase Plan
Various Employees
Third Anniversary of Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                                                              
Dividends declared and paid, per share $ 0.20 $ 0.60 $ 0.20 $ 0.40                                                                                                                      
Dividends declared and paid $ 19,600,000 $ 58,400,000 $ 19,500,000 $ 38,900,000                                                                                                                      
Stock repurchase programs authorized to purchase, shares 10,000,000                                                                                                                            
Excess tax benefit from share based compensation 20,121,000 16,040,000 7,568,000                                                                                                                        
Compensation cost recognized 27,783,000 22,518,000 18,225,000   25,800,000 20,100,000 15,800,000                     333,000 375,000       74,000 556,000 556,000 556,000 482,000   15,000 375,000       42,000 120,000   581,000 533,000 461,000 2,000,000 2,800,000 2,400,000           375,000 375,000 375,000 355,000     41,000 523,000 1,000,000       354,000 370,000 198,000  
Compensation cost recognized, pre-tax charge               25,800,000 20,100,000 15,800,000                                                                                                          
Compensation cost recognized, after-tax               16,100,000 12,500,000 9,800,000 853,000 1,400,000 1,200,000                                                                                                    
Compensation cost recognized                     1,400,000 2,300,000 2,000,000                                                                                                    
Shares reserved                                                                                           6,000,000 2,400,000           23,000,000                    
Stock options granted during period (net of cancellations) 2,889,750 2,966,850 2,894,500                                                                               2,737,725 2,621,161 2,473,500                                    
Weighted-average grant date fair value of option granted                                                                                     $ 13.33 $ 10.73 $ 11.62                                    
Total in-the-money value of all stock options exercised during the year 70,900,000 54,400,000 28,900,000                                                                                                                        
Stock issued under employee stock purchase plan                                                                         90,587 117,901 98,366                                                
Percentage of discount provided to eligible employees for purchase of shares under employee stock purchase plan                                                                         10.00%                                                    
Stock issued during period, net of cancellations 1,000,000                               1,200,000                                                                                            
Issuance of restricted shares approved, shares                                           61,362           109,850         62,190     22,250                               49,472   10,000   54,127           21,500  
Restricted shares price, per share                                           $ 24.45           $ 20.26         $ 24.12     $ 29.62                               $ 30.32   $ 80.36   $ 36.95           $ 53.21  
Issuance of restricted shares, value                                           1,500,000           2,200,000         1,500,000     659,000                               1,500,000   803,600   2,000,000           1,100,000  
Estimated compensation cost                                                                                               $ 20,000           $ 760,000 $ 500,000         $ 183,000      
Restricted Stock Purchase Plan, annual vesting percentage                                                                                                                 50.00% 25.00% 25.00%        
Fully vested shares 1,864,982                         39,831 62,044 78,133   15,341 15,341 15,340 15,340   27,463 27,462 27,462 27,463     15,548 15,546 15,548 15,548                               12,368 12,368 12,368         27,063         10,000 750   10,000
Number of shares cancelled                                                                                                                         750    
Stock-based compensation plans expired                                 2010-03                                                                                            
Issuance upon conversion of shares                                                                                           25,657,523