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, 2019	Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 101,400		$ 196,900
Total non-lease revenues				32,724		$ 33,623
Total revenues		127,439	$ 116,983	249,447		222,068
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		101,431	86,747	196,939		170,301
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		12,375	10,973	22,330		20,855
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		13,032	18,714	29,086		29,969
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		601	549	1,092		943
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		26,008	30,236	52,508		51,767
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				15,444		14,169
Total revenues		67,722	59,871	132,814		113,722
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		56,732	46,634	110,476		91,905
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,242	4,275	7,546		8,260
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,725	8,961	14,725		13,554
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		23	1	67		3
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		10,990	13,237	22,338		21,817
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				12,312		13,182
Total revenues		32,310	30,352	62,986		58,390
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		26,486	23,136	51,166		45,636
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		672	707	1,241		1,514
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,642	6,012	9,621		10,351
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		510	497	958		889
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,824	7,216	11,820		12,754
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues				1,091		543
Total revenues		26,335	23,049	49,770		44,227
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		18,213	16,977	35,297		32,760
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		7,461	5,991	13,543		11,081
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		593	30	863		335
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		68	51	67		51
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		8,122	6,072	14,473		11,467
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]			3,877		5,729
Total revenues		1,072	3,711	3,877	[1]	5,729	[1]
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		1,072	3,711	3,877		5,729
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 1,072	$ 3,711	$ 3,877		$ 5,729

[1] Gross Enviroplex sales revenues were $3,877 and $6,524 for the six months ended June 30, 2019 and 2018, respectively. There were $795 inter-segment sales to Mobile Modular in the six months ended June 30, 2018, which required elimination in consolidation.  There were no inter-segment sales in the six months ended June 30, 2019.