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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
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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 |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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