Segment Information - Schedule of Balance Sheet Information for Reportable Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 4,477,174	$ 3,546,472
Goodwill	788,146	747,106
Corporate, Other & Eliminations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	(480,556)	(910,472)
West Segment
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	152,761	152,775
West Segment | Operating Segment
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,326,305	1,278,062
Midwest Segment
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	322,745	327,088
Midwest Segment | Operating Segment
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,232,101	1,188,758
South Segment
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	188,850	200,417
South Segment | Operating Segment
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	822,980	804,318
East Segment
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	63,704	66,826
East Segment | Operating Segment
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	1,223,264	$ 1,185,806
Central Segment
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	60,086
Central Segment | Operating Segment
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 353,080