Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 389,251	$ 374,214	$ 774,736	$ 742,279
Lease revenue	5,416	5,237	11,073	10,087
Total revenues from contracts with all customers	394,667	379,451	785,809	752,366
Warehouse rent and storage
Disaggregation of Revenue [Line Items]
Total revenues	119,972	117,243	240,098	232,115
Warehouse services
Disaggregation of Revenue [Line Items]
Total revenues	162,380	159,240	323,169	315,380
Third-party managed
Disaggregation of Revenue [Line Items]
Total revenues	65,705	59,587	129,532	117,905
Transportation
Disaggregation of Revenue [Line Items]
Total revenues	38,889	35,795	77,234	71,977
Quarry
Disaggregation of Revenue [Line Items]
Total revenues	2,305	2,349	4,703	4,902
United States
Disaggregation of Revenue [Line Items]
Total revenues	316,879	303,657	627,965	602,223
Lease revenue	5,416	5,237	11,073	10,087
Total revenues from contracts with all customers	322,295	308,894	639,038	612,310
United States | Warehouse rent and storage
Disaggregation of Revenue [Line Items]
Total revenues	104,977	100,858	209,337	199,563
United States | Warehouse services
Disaggregation of Revenue [Line Items]
Total revenues	128,057	126,894	253,305	250,443
United States | Third-party managed
Disaggregation of Revenue [Line Items]
Total revenues	57,606	52,724	113,622	105,210
United States | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	23,934	20,832	46,998	42,105
United States | Quarry
Disaggregation of Revenue [Line Items]
Total revenues	2,305	2,349	4,703	4,902
Australia
Disaggregation of Revenue [Line Items]
Total revenues	56,368	52,926	114,593	105,210
Lease revenue	0	0	0	0
Total revenues from contracts with all customers	56,368	52,926	114,593	105,210
Australia | Warehouse rent and storage
Disaggregation of Revenue [Line Items]
Total revenues	9,605	9,590	19,945	18,974
Australia | Warehouse services
Disaggregation of Revenue [Line Items]
Total revenues	29,329	27,777	59,766	55,904
Australia | Third-party managed
Disaggregation of Revenue [Line Items]
Total revenues	3,373	2,279	6,622	3,783
Australia | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	14,061	13,280	28,260	26,549
Australia | Quarry
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
New Zealand
Disaggregation of Revenue [Line Items]
Total revenues	8,223	8,286	16,416	16,407
Lease revenue	0	0	0	0
Total revenues from contracts with all customers	8,223	8,286	16,416	16,407
New Zealand | Warehouse rent and storage
Disaggregation of Revenue [Line Items]
Total revenues	3,955	4,583	7,827	9,008
New Zealand | Warehouse services
Disaggregation of Revenue [Line Items]
Total revenues	4,099	3,530	8,216	7,027
New Zealand | Third-party managed
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
New Zealand | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	169	173	373	372
New Zealand | Quarry
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Argentina
Disaggregation of Revenue [Line Items]
Total revenues	3,055	4,761	6,474	9,527
Lease revenue	0	0	0	0
Total revenues from contracts with all customers	3,055	4,761	6,474	9,527
Argentina | Warehouse rent and storage
Disaggregation of Revenue [Line Items]
Total revenues	1,435	2,212	2,989	4,570
Argentina | Warehouse services
Disaggregation of Revenue [Line Items]
Total revenues	895	1,039	1,882	2,006
Argentina | Third-party managed
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Argentina | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	725	1,510	1,603	2,951
Argentina | Quarry
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Canada
Disaggregation of Revenue [Line Items]
Total revenues	4,726	4,584	9,288	8,912
Lease revenue	0	0	0	0
Total revenues from contracts with all customers	4,726	4,584	9,288	8,912
Canada | Warehouse rent and storage
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Canada | Warehouse services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Canada | Third-party managed
Disaggregation of Revenue [Line Items]
Total revenues	4,726	4,584	9,288	8,912
Canada | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Canada | Quarry
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 0	$ 0