Operating and Reporting Segments - Segment Information Excluding Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	$ 853,417	$ 796,288	$ 2,353,062	$ 2,006,676
Gross margin	178,854	149,472	457,247	380,713
Selling, general and administrative expenses	(88,221)	(78,746)	(256,378)	(206,895)
Equity in income/(loss) of unconsolidated entities	1,646	(120)	4,734	1,408
Interest and other (expense) income, net	(1,888)	(2,360)	(8,453)	(11,460)
Loss on extinguishment of debt	0	0	0	(33,317)
Gain on foreign currency forward	0	0	0	29,983
Income from continuing operations before income taxes	90,391	68,246	197,150	160,432
Operating Segments [Member] | East [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	278,152	223,625	711,681	523,435
Gross margin	69,473	47,459	160,130	113,813
Selling, general and administrative expenses	(25,505)	(20,536)	(72,123)	(49,742)
Equity in income/(loss) of unconsolidated entities	132	0	440	241
Interest and other (expense) income, net	(562)	(825)	(2,517)	(1,850)
Loss on extinguishment of debt				0
Gain on foreign currency forward				0
Income from continuing operations before income taxes	43,538	26,098	85,930	62,462
Operating Segments [Member] | Central [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	244,578	255,400	687,088	706,475
Gross margin	48,016	49,532	129,312	135,719
Selling, general and administrative expenses	(22,765)	(21,926)	(65,532)	(61,553)
Equity in income/(loss) of unconsolidated entities	331	(427)	110	188
Interest and other (expense) income, net	(1,172)	(3,113)	(3,232)	(10,136)
Loss on extinguishment of debt				0
Gain on foreign currency forward				0
Income from continuing operations before income taxes	24,410	24,066	60,658	64,218
Operating Segments [Member] | West [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	316,873	305,947	917,342	747,972
Gross margin	55,428	48,127	153,448	120,507
Selling, general and administrative expenses	(21,945)	(19,822)	(64,375)	(50,633)
Equity in income/(loss) of unconsolidated entities	319	(197)	1,303	(619)
Interest and other (expense) income, net	(512)	(108)	(1,462)	421
Loss on extinguishment of debt				0
Gain on foreign currency forward				0
Income from continuing operations before income taxes	33,290	28,000	88,914	69,676
Operating Segments [Member] | Mortgage Operations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	13,814	11,316	36,951	28,794
Gross margin	5,937	4,354	14,357	10,674
Selling, general and administrative expenses	0	(2)	0	(2)
Equity in income/(loss) of unconsolidated entities	864	504	2,881	1,598
Interest and other (expense) income, net	4	0	14	0
Loss on extinguishment of debt				0
Gain on foreign currency forward				0
Income from continuing operations before income taxes	6,805	4,856	17,252	12,270
Corporate and Unallocated [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total revenues	0	0	0	0
Gross margin	0	0	0	0
Selling, general and administrative expenses	(18,006)	(16,460)	(54,348)	(44,965)
Equity in income/(loss) of unconsolidated entities	0	0	0	0
Interest and other (expense) income, net	354	1,686	(1,256)	105
Loss on extinguishment of debt				(33,317)
Gain on foreign currency forward				29,983
Income from continuing operations before income taxes	$ (17,652)	$ (14,774)	$ (55,604)	$ (48,194)