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, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 97,900		$ 200,100
Total non-lease revenues				47,005		$ 32,724
Total revenues		137,673	$ 127,439	267,126		249,447
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		97,872	101,431	200,109		196,939
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		9,352	12,375	22,150		22,330
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		30,083	13,032	44,012		29,086
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		366	601	855		1,092
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		39,801	26,008	67,017		52,508
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				23,315		15,444
Total revenues		76,762	67,722	149,960		132,814
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		57,890	56,732	117,126		110,476
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		3,533	4,242	10,223		7,546
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		15,316	6,725	22,572		14,725
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		23	23	39		67
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		18,872	10,990	32,834		22,338
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				12,098		12,312
Total revenues		33,079	32,310	67,142		62,986
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		26,837	26,486	55,057		51,166
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		563	672	1,282		1,241
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,336	4,642	10,008		9,621
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		343	510	795		958
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,242	5,824	12,085		11,820
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				890		1,091
Total revenues		18,633	26,335	39,322		49,770
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		13,145	18,213	27,926		35,297
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,256	7,461	10,645		13,543
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		232	593	730		863
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues			68	21		67
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,488	8,122	11,396		14,473
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]			10,702		3,877
Total revenues		9,199	1,072	10,702	[1]	3,877	[1]
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		9,199	1,072	10,702		3,877
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 9,199	$ 1,072	$ 10,702		$ 3,877

[1] Gross Enviroplex sales revenues were $11,979 and $3,877 for the six months ended June 30, 2020 and 2019, respectively. There were $1,277 inter-segment sales to Mobile Modular in the six months ended June 30, 2020, which required elimination in consolidation.  There were no inter-segment sales in the six months ended June 30, 2019.