Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Leasing revenues										$ 411,000
Total non-lease revenues										115,303	$ 96,649	$ 94,549
Total revenues		$ 147,221	$ 173,562	$ 127,439	$ 122,008	$ 133,115	$ 143,147	$ 116,983	$ 105,085	570,230	498,330	462,034
Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues										410,993	365,212	331,218
Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										49,197	41,753	40,011
Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										107,120	89,452	89,302
Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										2,920	1,913	1,503
Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										159,237	133,118	130,816
Mobile Modular [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										49,299	40,742	38,234
Total revenues										301,010	254,574	231,266
Mobile Modular [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues										234,032	200,214	180,612
Mobile Modular [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										18,964	14,870	13,331
Mobile Modular [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										47,045	39,467	37,434
Mobile Modular [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										969	23	(111)
Mobile Modular [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										66,978	54,360	50,654
TRS-RenTelco [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										24,519	25,420	22,374
Total revenues										131,483	118,657	108,044
TRS-RenTelco [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues										108,044	94,345	85,930
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										2,599	2,607	2,358
TRS-RenTelco [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										18,995	19,895	18,137
TRS-RenTelco [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										1,845	1,810	1,619
TRS-RenTelco [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										23,439	24,312	22,114
Adler Tanks [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										1,671	1,441	2,572
Total revenues										97,923	96,053	91,355
Adler Tanks [Member] | Leasing [Member]
Disaggregation Of Revenue [Line Items]
Leasing revenues										68,917	70,653	64,676
Adler Tanks [Member] | Non-lease Rental Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										27,634	24,276	24,322
Adler Tanks [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										1,266	1,044	2,362
Adler Tanks [Member] | Non-lease Other [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										106	80	(5)
Adler Tanks [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										29,006	25,400	26,679
Enviroplex [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues	[1]									39,814	29,046	31,369
Total revenues	[1]									39,814	29,046	31,369
Enviroplex [Member] | Non-lease Sales [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										39,814	29,046	31,369
Enviroplex [Member] | Non-lease Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total non-lease revenues										$ 39,814	$ 29,046	$ 31,369

[1] Gross Enviroplex sales revenues were $39,814, $30,407 and $31,369 in 2019, 2018 and 2017, respectively.  There were $1,361 inter-segment sales to Mobile Modular in 2018, which have been eliminated in consolidation.  There were no inter-segment sales in 2019 and 2017.