Property and Equipment, Net - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation and amortization on property and equipment	$ (36,836)	$ (20,453)
Property and equipment, net	251,942	148,681
Land and site improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	44,042	11,656
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	108,116	60,804
Transportation fleet
Property, Plant and Equipment [Line Items]
Property and equipment, gross	52,742	39,153
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32,335	21,009
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,005	12,239
Property and equipment excluding construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	255,240	144,861
Property and equipment, net	218,404	124,408
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 33,538	$ 24,273