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Segment Disclosures - Profit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	$ 131,590	$ 84,133	$ 266,876	$ 179,046
Equity-based compensation expense	(11,733)	(16,963)	(30,385)	(50,136)
Operating Segments [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	146,544	94,999	282,994	212,266
Operating Segments [Member] | Homebuilding Mid Atlantic [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	92,496	56,763	177,762	130,428
Operating Segments [Member] | Homebuilding North East [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	8,031	8,383	18,114	16,476
Operating Segments [Member] | Homebuilding Mid East [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	21,823	13,652	33,058	24,256
Operating Segments [Member] | Homebuilding South East [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	11,529	5,555	20,277	13,839
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Mortgage Banking	12,665	10,646	33,783	27,267
Reconciling Items Sub-Total [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	(14,954)	(10,866)	(16,118)	(33,220)
Reconciling Items Sub-Total [Member] | Contract Land Deposit Reserve Adjustment [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	699	(764)	4,551	586
Reconciling Items Sub-Total [Member] | Equity-Based Compensation Expense [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Equity-based compensation expense	(11,733)	(16,963)	(30,385)	(50,136)
Reconciling Items Sub-Total [Member] | Corporate Capital Allocation [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	31,297	24,712	86,588	66,239
Reconciling Items Sub-Total [Member] | Unallocated Corporate Overhead [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	(13,969)	(19,027)	(60,139)	(53,039)
Reconciling Items Sub-Total [Member] | Consolidation Adjustments and Other [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	(15,743)	2,486	(605)	4,562
Reconciling Items Sub-Total [Member] | Corporate Interest Expense [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	$ (5,505)	$ (1,310)	$ (16,128)	$ (1,432)

X

- Definition

Mortgage banking income from continuing operations before stock-based compensation expense and income taxes.

+ References

No definition available.

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X

- Definition

Amount of an item in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, discontinued operations.

+ References

No definition available.

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X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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