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Revenue Recognition - Summary of Disaggregates the Company's Revenue by Lease and Non Lease (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leasing revenues |  |  |  |  |  |  |  |  |  | $ 401,900 |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 128,371 | $ 115,303 | $ 96,649
Total revenues |  | $ 148,980 | $ 156,448 | $ 137,673 | $ 129,453 | $ 147,221 | $ 173,562 | $ 127,439 | $ 122,008 | 572,554 | 570,230 | 498,330
Leasing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leasing revenues |  |  |  |  |  |  |  |  |  | 401,923 | 410,993 | 365,212
Non-lease Rental Related Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 46,514 | 49,197 | 41,753
Non-lease Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 122,447 | 107,120 | 89,452
Non-lease Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 1,670 | 2,920 | 1,913
Non-lease Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 170,631 | 159,237 | 133,118
Mobile Modular [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 65,278 | 49,299 | 40,742
Total revenues |  |  |  |  |  |  |  |  |  | 321,524 | 301,010 | 254,574
Mobile Modular [Member] | Leasing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leasing revenues |  |  |  |  |  |  |  |  |  | 235,003 | 234,032 | 200,214
Mobile Modular [Member] | Non-lease Rental Related Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 22,576 | 18,964 | 14,870
Mobile Modular [Member] | Non-lease Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 63,863 | 47,045 | 39,467
Mobile Modular [Member] | Non-lease Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 82 | 969 | 23
Mobile Modular [Member] | Non-lease Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 86,521 | 66,978 | 54,360
TRS-RenTelco [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 28,648 | 24,519 | 25,420
Total revenues |  |  |  |  |  |  |  |  |  | 140,811 | 131,483 | 118,657
TRS-RenTelco [Member] | Leasing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leasing revenues |  |  |  |  |  |  |  |  |  | 112,210 | 108,044 | 94,345
TRS-RenTelco [Member] | Non-lease Rental Related Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 2,618 | 2,599 | 2,607
TRS-RenTelco [Member] | Non-lease Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 24,461 | 18,995 | 19,895
TRS-RenTelco [Member] | Non-lease Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 1,522 | 1,845 | 1,810
TRS-RenTelco [Member] | Non-lease Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 28,601 | 23,439 | 24,312
Adler Tanks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 1,708 | 1,671 | 1,441
Total revenues |  |  |  |  |  |  |  |  |  | 77,482 | 97,923 | 96,053
Adler Tanks [Member] | Leasing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Leasing revenues |  |  |  |  |  |  |  |  |  | 54,710 | 68,917 | 70,653
Adler Tanks [Member] | Non-lease Rental Related Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 21,320 | 27,634 | 24,276
Adler Tanks [Member] | Non-lease Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 1,386 | 1,266 | 1,044
Adler Tanks [Member] | Non-lease Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 66 | 106 | 80
Adler Tanks [Member] | Non-lease Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 22,772 | 29,006 | 25,400
Enviroplex [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues | [1] |  |  |  |  |  |  |  |  | 32,737 | 39,814 | 29,046
Total revenues | [1] |  |  |  |  |  |  |  |  | 32,737 | 39,814 | 29,046
Enviroplex [Member] | Non-lease Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | 32,737 | 39,814 | 29,046
Enviroplex [Member] | Non-lease Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total non-lease revenues |  |  |  |  |  |  |  |  |  | $ 32,737 | $ 39,814 | $ 29,046
[1] | Gross Enviroplex sales revenues were $34,014, $39,814 and $30,407 in 2020, 2019 and 2018, respectively. There were $1,277 and $1,361 inter-segment sales to Mobile Modular in 2020 and 2018, which have been eliminated in consolidation. There were no inter-segment sales in 2019.

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- Definition Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919372-209981 + Details
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