Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 100,700		$ 300,800
Total non-lease revenues				90,275		$ 84,613
Total revenues		156,448	$ 173,562	423,574		423,009
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		100,717	107,215	300,826		304,154
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		13,621	16,039	35,771		38,369
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		41,681	49,791	85,694		78,877
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		429	517	1,283		1,609
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		55,731	66,347	122,748		118,855
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				52,910		32,434
Total revenues		95,413	86,302	245,373		219,116
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		58,655	61,519	175,781		171,995
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		7,488	8,105	17,711		15,651
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		29,275	16,676	51,847		31,401
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		(5)	2	34		69
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		36,758	24,783	69,592		47,121
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				19,535		18,601
Total revenues		35,856	34,090	102,998		97,076
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		28,530	28,284	83,587		79,450
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		668	717	1,950		1,958
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,262	4,614	16,271		14,235
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		396	475	1,190		1,433
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		7,326	5,806	19,411		17,626
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				1,214		1,340
Total revenues		19,265	24,809	58,587		74,579
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		13,532	17,412	41,458		52,709
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,465	7,217	16,110		20,760
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		230	140	960		1,003
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		38	40	59		107
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,733	7,397	17,129		21,870
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]			16,616		32,238
Total revenues		5,914	28,361	16,616	[1]	32,238	[1]
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,914	28,361	16,616		32,238
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 5,914	$ 28,361	$ 16,616		$ 32,238

[1] Gross Enviroplex sales revenues were $17,893 and $32,237 for the nine months ended September 30, 2020 and 2019, respectively. There were $1,277 inter-segment sales to Mobile Modular in the nine months ended September 30, 2020, which required elimination in consolidation.  There were no inter-segment sales in the nine months ended September 30, 2019.