Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 98,000
Total non-lease revenues		15,439	$ 15,436
Total revenues		121,195	129,453
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		97,955	102,235
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		8,575	12,798
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		14,339	13,930
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		326	490
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		23,240	27,218
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		7,940	7,644
Total revenues		68,648	73,198
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		57,803	59,235
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		3,206	6,690
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		7,620	7,256
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		19	17
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		10,845	13,963
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,587	5,701
Total revenues		33,603	34,063
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		27,813	28,220
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		608	719
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,877	4,673
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		305	451
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,790	5,843
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		678	588
Total revenues		17,710	20,689
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		12,339	14,780
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,761	5,389
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		608	498
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		2	22
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,371	5,909
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]	1,234	1,503
Total revenues	[1]	1,234	1,503
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		1,234	1,503
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 1,234	$ 1,503

[1] Gross Enviroplex sales revenues were $2,090 and $2,778 for the three months ended March 31, 2021 and 2020, respectively. There were $856 and $1,275 inter-segment sales to Mobile Modular in the three months ended March 31, 2021 and 2020, respectively, which required elimination in consolidation.