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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price $ 0    
Restricted share units vesting period or Option vesting period 2 years    
Options outstanding 639,078 737,702  
Maximum shares available for grant 172,107    
Restricted share units outstanding 82,619    
Restricted share units weighted average fair value of grants $ 738.71    
Equity-based compensation costs $ 64,841 $ 64,473 $ 53,136
Tax benefit related to equity-based compensation costs 23,900 23,600 19,200
Forfeiture estimate adjustment 2,500   7,600
Forfeiture estimate adjustment charged from homebuilding general and administrative expense 1,950   6,600
Forfeiture estimate adjustment charged from homebuilding cost of sales expense 450   400
Forfeiture estimate adjustment charged from NVRM general and administrative expense 100   600
Total unrecognized compensation cost for all outstanding Options and RSUs 68,973    
Weighted-average period over which the unrecognized compensation will be recorded 1 year 10 months 24 days    
Options exercised (shares) 221,992 333,380 359,765
Combined plan contribution $ 9,575 $ 6,616 $ 6,567
Shares contributed to the Employee Stock Ownership Plan 9,200 9,300  
Common stock shares held in rabbi trust account 152,223 152,964  
Shares of common stock issued from rabbi trust account 741    
1998 Option Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares available for grant 0    
Options authorized under the plan 1,000,000    
Number of years for Options expiration 10 years    
Options vesting rights Vest 25% increments beginning on December 31,2006, or later depending on the grant date.    
Percentage of Options vesting rights 25.00%    
1998 Directors' Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares available for grant 0    
Options authorized under the plan 150,000    
Number of years for Options expiration 10 years    
2000 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares available for grant 0    
Options authorized under the plan 2,000,000    
Number of years for Options expiration 10 years    
Options vesting rights Vest annually in 25% increments beginning on December 31,2006, or later as determined by the date of grant.    
Percentage of Options vesting rights 25.00%    
Percentage of total options authorized 50.00%    
Options distribution limitation for key employees and members of the board Limited to 50% or less of the total options authorized under the Plan.    
RSUs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price $ 0    
Maximum shares available for grant 83,967    
Options authorized under the plan 240,000    
Options vesting rights RSUs will vest in 50% increments ranging from December 31, 2013 through December 31, 2016.    
Percentage of Options vesting rights 50.00%    
Options issued under the plan 4,585    
1996 Option Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum shares available for grant 0    
Options authorized under the plan 2,000,000    
Number of years for Options expiration 10 years    
2010 Equity Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price $ 0    
Maximum shares available for grant 172,107    
Options authorized under the plan 700,000    
Number of years for Options expiration 10 years    
Options vesting rights 25% increments beginning on December 31, 2014    
Options issued under the plan 84,073    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or Option vesting period 3 years    
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or Option vesting period 6 years