Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended			6 Months Ended
		Nov. 19, 2019	Feb. 01, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets				$ 3,667		$ 930	$ 3,667	$ 13,485
Interest capitalized				400		800	1,200	1,600
Compensation and travel expense capitalized				200		100	300	300
Payments for asset acquisitions							0	35,923
Equity				(2,131,006)	$ (2,020,676)	(1,855,657)	(2,131,006)	(1,855,657)	$ (1,833,018)	$ (680,477)	$ (706,755)
Assets under new accounting pronouncement				567,000			567,000
Accounts receivable – net of allowance				10,481			10,481		6,927
Port Fresh Holdings, LLC
Property, Plant and Equipment [Line Items]
Payments for asset acquisitions			$ 35,200
MHW Group Inc.
Property, Plant and Equipment [Line Items]
Payments for asset acquisitions		$ 50,800
Property, plant and equipment		50,100
Intangible assets		600
Other assets (liabilities), net		100
Call option to purchase land		$ 4,100
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
Transportation assets
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets						900
Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Equity	[1]								500
Retained Earnings
Property, Plant and Equipment [Line Items]
Equity				$ 767,027	$ 756,418	$ 707,170	$ 767,027	$ 707,170	736,861	$ 673,297	$ 638,345
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Equity	[1]								$ 500

[1] Refer to Note 2 to the Condensed Consolidated Financial Statements for further discussion of the adoption of ASC 326.