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, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 118,100		$ 323,500
Total non-lease revenues				83,115		$ 90,275
Total revenues		173,292	$ 156,448	440,922		423,574
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		118,078	100,717	323,543		300,826
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		17,458	13,621	36,952		35,771
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		37,365	41,681	79,309		85,694
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		391	429	1,118		1,283
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		55,214	55,731	117,379		122,748
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				49,770		52,910
Total revenues		110,394	95,413	263,614		245,373
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		73,375	58,655	196,362		175,781
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		10,628	7,488	18,418		17,711
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		26,362	29,275	48,766		51,847
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		29	(5)	68		34
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		37,019	36,758	67,252		69,592
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				15,971		19,535
Total revenues		35,074	35,856	102,460		102,998
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		29,692	28,530	86,223		83,587
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		591	668	1,821		1,950
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,502	6,262	13,485		16,271
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		289	396	931		1,190
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,382	7,326	16,237		19,411
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				2,477		1,214
Total revenues		22,283	19,265	59,951		58,587
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		15,011	13,532	40,958		41,458
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,239	5,465	16,713		16,110
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		960	230	2,161		960
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		73	38	119		59
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		7,272	5,733	18,993		17,129
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]			14,897		16,616
Total revenues		5,541	5,914	14,897	[1]	16,616	[1]
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,541	5,914	14,897		16,616
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 5,541	$ 5,914	$ 14,897		$ 16,616

[1] Gross Enviroplex sales revenues were $15,909 and $17,892 for the nine months ended September 30, 2021 and 2020, respectively. There were $1,012 and $1,276 inter-segment sales to Mobile Modular in the nine months ended September 30, 2021 and 2020, respectively, which required elimination in consolidation.