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Segment Information, Nature of Operations, and Certain Concentrations - Profits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Profit Reconciling Item [Line Items]
Equity-based compensation expense	$ (34,296)	$ (64,841)	$ (64,473)
Consolidated income before taxes	418,696	275,077	207,576
Operating Segments [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	423,306	309,274	229,294
Operating Segments [Member] | Homebuilding Mid Atlantic [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	276,399	189,089	148,373
Operating Segments [Member] | Homebuilding North East [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	14,294	21,529	13,463
Operating Segments [Member] | Homebuilding Mid East [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	55,537	39,847	27,194
Operating Segments [Member] | Homebuilding South East [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Consolidated income before taxes	35,001	20,674	14,162
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Mortgage Banking	42,075	38,135	26,102
Reconciling Items Sub-Total [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	(4,610)	(34,197)	(21,718)
Consolidated income before taxes	418,696	275,077	207,576
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	5,313	5,333	(2,878)
Reconciling Items Sub-Total [Member] | Equity-Based Compensation Expense [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Equity-based compensation expense	(34,296)	(64,841)	(64,473)
Reconciling Items Sub-Total [Member] | Corporate Capital Allocation [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	116,457	91,507	71,226
Reconciling Items Sub-Total [Member] | Unallocated Corporate Overhead [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	(72,703)	(70,258)	(45,355)
Reconciling Items Sub-Total [Member] | Consolidation Adjustments and Other [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	2,362	10,858	20,477
Reconciling Items Sub-Total [Member] | Corporate Interest Expense [Member]
Segment Reporting, Profit Reconciling Item [Line Items]
Segment reporting reconciling item for operating profit	$ (21,743)	$ (6,796)	$ (715)

X

- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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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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