Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 95,500
Total non-lease revenues		17,857	$ 12,993
Total revenues		122,008	105,085
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		95,507	83,553
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		9,953	9,882
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		16,054	11,255
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		494	395
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		26,501	21,532
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		8,360	4,890
Total revenues		65,092	53,851
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		53,743	45,271
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		3,304	3,985
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		8,000	4,593
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		45	2
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		11,349	8,580
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,345	5,702
Total revenues		30,676	28,038
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		24,680	22,499
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		568	807
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		4,979	4,339
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		449	393
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		5,996	5,539
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		347	383
Total revenues		23,435	21,178
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		17,084	15,783
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,081	5,090
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		270	305
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		6,351	5,395
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]	2,805	2,018
Total revenues	[1]	2,805	2,018
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		2,805	2,018
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 2,805	$ 2,018

[1] Gross Enviroplex sales revenues were $2,805 and $2,813 for the three months ended March 31, 2019 and 2018, respectively. There were $795 inter-segment sales to Mobile Modular in the three months ended March 31, 2018, which required elimination in consolidation. There were no inter-segment sales in the three months ended March 31, 2019.