Segment Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Investments in partially owned entities	$ 14,541	$ 15,942
Total assets	2,532,428	2,394,897
Operating Segments
Segment Reporting Information [Line Items]
Assets, excluding investments in partially owned entities	2,147,726	2,171,490
Operating Segments | Warehouse
Segment Reporting Information [Line Items]
Assets, excluding investments in partially owned entities	2,054,968	2,082,156
Operating Segments | Third-party managed
Segment Reporting Information [Line Items]
Assets, excluding investments in partially owned entities	43,725	43,035
Operating Segments | Transportation
Segment Reporting Information [Line Items]
Assets, excluding investments in partially owned entities	35,479	32,402
Operating Segments | Other
Segment Reporting Information [Line Items]
Assets, excluding investments in partially owned entities	13,554	13,897
Corporate
Segment Reporting Information [Line Items]
Assets, excluding investments in partially owned entities	370,161	207,465
Reconciling Items
Segment Reporting Information [Line Items]
Investments in partially owned entities	14,541	15,942
Total reconciling items
Segment Reporting Information [Line Items]
Total assets	$ 384,702	$ 223,407