Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 107,500		$ 205,500
Total non-lease revenues				44,605		$ 47,005
Total revenues		146,435	$ 137,673	267,630		267,126
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		107,510	97,872	205,464		200,109
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		10,918	9,352	19,493		22,150
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		27,607	30,083	41,945		44,012
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		400	366	728		855
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		38,925	39,801	62,166		67,017
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				23,067		23,315
Total revenues		84,572	76,762	153,220		149,960
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		65,184	57,890	122,987		117,126
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,584	3,533	7,790		10,223
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		14,784	15,316	22,404		22,572
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		20	23	39		39
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		19,388	18,872	30,233		32,834
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				10,800		12,098
Total revenues		33,783	33,079	67,386		67,142
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		28,717	26,837	56,530		55,057
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		621	563	1,229		1,282
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,108	5,336	8,984		10,008
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		337	343	643		795
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,066	6,242	10,856		12,085
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				1,382		890
Total revenues		19,958	18,633	37,668		39,322
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		13,609	13,145	25,947		27,926
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,713	5,256	10,474		10,645
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		593	232	1,201		730
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		43		46		21
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,349	5,488	11,721		11,396
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]			9,356		10,702
Total revenues		8,122	9,199	9,356	[1]	10,702	[1]
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		8,122	9,199	9,356		10,702
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 8,122	$ 9,199	$ 9,356		$ 10,702

[1] Gross Enviroplex sales revenues were 10,211 and $11,979 for the six months ended June 30, 2021 and 2020, respectively. There were $855 and $1,277 inter-segment sales to Mobile Modular in the six months ended June 30, 2021 and 2020, respectively, which required elimination in consolidation.