Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
West [Member]
Segment Reporting Information [Line Items]
Revenues	$ 134,979	$ 69,542
Mountain [Member]
Segment Reporting Information [Line Items]
Revenues	133,377	60,591
East [Member]
Segment Reporting Information [Line Items]
Revenues	63,392	56,135
Homebuilding [Member]
Segment Reporting Information [Line Items]
Revenues	331,748	186,268
Mortgage operations [Member]
Segment Reporting Information [Line Items]
Revenues	9,044	5,456
Other Financial Services [Member]
Segment Reporting Information [Line Items]
Revenues	3,462	2,264
Financial Services [Member]
Segment Reporting Information [Line Items]
Revenues	$ 12,506	$ 7,720