Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Leasing revenues		$ 442,600
Total non-lease revenues		128,759	$ 128,371	$ 115,303
Total revenues		616,833	572,554	570,230
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		442,598	401,923	410,993
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		49,990	46,514	49,197
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		122,781	122,447	107,120
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		1,464	1,670	2,920
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		174,235	170,631	159,237
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		70,417	65,278	49,299
Total revenues		363,316	321,524	301,010
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		269,175	235,003	234,032
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		25,034	22,576	18,964
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		68,982	63,863	47,045
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		125	82	969
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		94,141	86,521	66,978
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		23,895	28,648	24,519
Total revenues		140,194	140,811	131,483
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		116,769	112,210	108,044
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		2,469	2,618	2,599
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		19,788	24,461	18,995
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		1,168	1,522	1,845
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		23,425	28,601	23,439
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		3,366	1,708	1,671
Total revenues		82,242	77,482	97,923
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues		56,654	54,710	68,917
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		22,487	21,320	27,634
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		2,930	1,386	1,266
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		171	66	106
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		25,588	22,772	29,006
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]	31,081	32,737	39,814
Total revenues	[1]	31,081	32,737	39,814
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		31,081	32,737	39,814
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues		$ 31,081	$ 32,737	$ 39,814

[1] Gross Enviroplex sales revenues were $32,095, $34,014 and $39,814 in 2021, 2020 and 2019, respectively.  There were $1,014 and $1,277 inter-segment sales to Mobile Modular in 2021 and 2020, which have been eliminated in consolidation.  There were no inter-segment sales in 2019.