Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Feb. 01, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets		$ 930	$ 12,600	$ 747	$ 13,485	$ 747
Interest expensed		800		700	1,600	1,100
Compensation and travel expense capitalized		$ 100		$ 200	300	300
Payments for asset acquisitions					35,923	0
Port Fresh Holdings, LLC
Property, Plant and Equipment [Line Items]
Payments for asset acquisitions	$ 35,900				$ 35,923	$ 0
Partially Used Warehouse
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets			$ 9,600
Percentage of facility to be demolished			75.00%
Idle Warehouse
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets			$ 2,900