Segment Information - Schedule of Segment Financial Information Relating to Operations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating revenue
Total operating revenue		$ 342,714	$ 249,207	$ 932,792	$ 701,070
Income before provision for income taxes:
Income before provision for income taxes		24,809	17,233	62,400	48,913
Corporate
Income before provision for income taxes:
Income before provision for income taxes		(8,095)	(5,798)	(23,838)	(17,496)
California
Operating revenue
Total operating revenue	[1]	111,520	65,661	309,199	240,115
California | Reportable Operating Segments
Income before provision for income taxes:
Income before provision for income taxes		10,364	5,679	28,252	26,756
Arizona
Operating revenue
Total operating revenue		28,758	21,088	85,399	38,782
Arizona | Reportable Operating Segments
Income before provision for income taxes:
Income before provision for income taxes		2,542	1,692	7,537	2,302
Nevada
Operating revenue
Total operating revenue		49,600	31,924	128,996	89,937
Nevada | Reportable Operating Segments
Income before provision for income taxes:
Income before provision for income taxes		5,291	2,611	12,587	8,660
Colorado
Operating revenue
Total operating revenue		35,316	23,864	85,885	69,457
Colorado | Reportable Operating Segments
Income before provision for income taxes:
Income before provision for income taxes		2,342	742	3,643	1,381
Washington
Operating revenue
Total operating revenue		42,247	46,905	112,512	124,371
Washington | Reportable Operating Segments
Income before provision for income taxes:
Income before provision for income taxes		2,899	5,609	6,767	12,501
Oregon
Operating revenue
Total operating revenue		75,273	59,765	210,801	138,408
Oregon | Reportable Operating Segments
Income before provision for income taxes:
Income before provision for income taxes		$ 9,466	$ 6,698	$ 27,452	$ 14,809

[1] Operating revenue in the California segment includes construction services revenue.