Reporting Segments - Reconciliation to Net Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	$ 769,090	$ 645,329
Gross margin	141,693	118,641
Selling, general and administrative expenses	(88,745)	(77,265)
Equity in (loss)/income of unconsolidated entities	1,085	782
Interest and other (expense)/income, net	441	(3,167)
Income before income taxes	54,474	38,991
Operating Segments | East
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	263,665	181,725
Gross margin	53,358	37,778
Selling, general and administrative expenses	(27,169)	(21,996)
Equity in (loss)/income of unconsolidated entities	0	0
Interest and other (expense)/income, net	(84)	(1,246)
Income before income taxes	26,105	14,536
Operating Segments | Central
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	206,257	222,567
Gross margin	37,208	40,224
Selling, general and administrative expenses	(21,492)	(21,613)
Equity in (loss)/income of unconsolidated entities	(168)	(57)
Interest and other (expense)/income, net	(344)	(1,643)
Income before income taxes	15,204	16,911
Operating Segments | West
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	284,919	231,398
Gross margin	45,580	37,524
Selling, general and administrative expenses	(19,053)	(16,406)
Equity in (loss)/income of unconsolidated entities	(83)	244
Interest and other (expense)/income, net	(125)	227
Income before income taxes	26,319	21,589
Operating Segments | Mortgage Operations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	14,249	9,639
Gross margin	5,547	3,115
Selling, general and administrative expenses	0	0
Equity in (loss)/income of unconsolidated entities	1,336	595
Interest and other (expense)/income, net	0	0
Income before income taxes	6,883	3,710
Corporate and Unallocated
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	0	0
Gross margin	0	0
Selling, general and administrative expenses	(21,031)	(17,250)
Equity in (loss)/income of unconsolidated entities	0	0
Interest and other (expense)/income, net	994	(505)
Income before income taxes	$ (20,037)	$ (17,755)