Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Rental revenues				$ 357,293		$ 333,226
Rental related services revenues				104,065		88,497
Sales and other revenues				158,334		101,217
Total revenues		$ 243,506	$ 200,536	619,692		522,940
Depreciation of rental equipment				67,824		72,114
Gross profit				288,176		233,766
Selling and administrative expenses				155,614		124,010
Other income				(3,559)
Income (loss) from operations				136,121		109,756
Interest (expense) income allocation				(28,808)		(9,998)
Income before provision for income taxes				107,479		99,354
Adjusted EBITDA				237,728		197,897
Rental equipment acquisitions				163,868		134,131
Accounts receivable, net (period end)		224,269	189,959	224,269		189,959		$ 169,937
Rental equipment, at cost (period end)		1,857,365	1,790,735	1,857,365		1,790,735		1,521,535
Rental equipment, net book value (period end)		1,291,868	1,099,822	1,291,868		1,099,822		$ 990,317
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Rental revenues				264,398		195,598
Rental related services revenues				99,158		66,947
Sales and other revenues				122,245		65,315
Total revenues		194,882	125,838	485,801		327,860
Depreciation of rental equipment				29,766		23,329
Gross profit				233,970		149,405
Selling and administrative expenses				124,642		79,245
Other income				(2,740)
Income (loss) from operations				112,068		70,160
Interest (expense) income allocation				(24,129)		(6,616)
Income before provision for income taxes				87,939		63,544
Adjusted EBITDA				172,222		106,156
Rental equipment acquisitions				142,067		73,895
Accounts receivable, net (period end)		186,354	139,730	186,354		139,730
Rental equipment, at cost (period end)		1,474,359	1,085,060	1,474,359		1,085,060
Rental equipment, net book value (period end)		1,141,194	780,939	$ 1,141,194		$ 780,939
Utilization (period end)	[1]			79.70%		81.20%
Average utilization	[1]			79.50%		78.50%
TRS-RenTelco [Member]
Segment Reporting Information [Line Items]
Rental revenues				$ 86,375		$ 89,990
Rental related services revenues				2,323		2,329
Sales and other revenues				24,376		17,040
Total revenues		39,109	38,527	113,074		109,359
Depreciation of rental equipment				36,733		36,789
Gross profit				47,184		48,824
Selling and administrative expenses				23,576		19,930
Other income				(819)
Income (loss) from operations				24,427		28,894
Interest (expense) income allocation				(6,008)		(2,160)
Income before provision for income taxes				18,585		26,330
Adjusted EBITDA				64,031		66,675
Rental equipment acquisitions				21,801		57,169
Accounts receivable, net (period end)		29,086	24,353	29,086		24,353
Rental equipment, at cost (period end)		383,006	396,068	383,006		396,068
Rental equipment, net book value (period end)		150,674	177,221	$ 150,674		$ 177,221
Utilization (period end)	[1]			60.30%		65.20%
Average utilization	[1]			59.00%		64.80%
Adler Tanks (Discontinued) [Member]
Segment Reporting Information [Line Items]
Rental revenues	[2]			$ 6,520		$ 47,638
Rental related services revenues	[2]			2,584		19,221
Sales and other revenues	[2]			334		3,317
Total revenues			26,193	9,438	[2]	70,176	[2]
Depreciation of rental equipment	[2]			1,325		11,996
Gross profit	[2]			4,665		31,933
Selling and administrative expenses	[2]			2,582		20,642
Income (loss) from operations	[2]			2,083		11,291
Interest (expense) income allocation	[2]			(374)		(1,941)
Income before provision for income taxes	[2]			1,709		9,350
Adjusted EBITDA	[2]			3,682		25,443
Rental equipment acquisitions	[2]					3,067
Accounts receivable, net (period end)	[2]		18,185			18,185
Rental equipment, at cost (period end)	[2]		309,607			309,607
Rental equipment, net book value (period end)	[2]		141,662			141,662
Enviroplex [Member]
Segment Reporting Information [Line Items]
Sales and other revenues	[3]			11,379		15,545
Total revenues		9,515	9,978	11,379	[3]	15,545	[3]
Gross profit	[3]			2,357		3,604
Selling and administrative expenses	[3]			4,814		4,193
Income (loss) from operations	[3]			(2,457)		(589)
Interest (expense) income allocation	[3]			1,703		719
Income before provision for income taxes	[3]			(754)		130
Adjusted EBITDA	[3]			(2,207)		(377)
Accounts receivable, net (period end)	[3]	$ 8,829	$ 7,691	$ 8,829		$ 7,691

[1] Utilization is calculated each month by dividing the cost of rental equipment on rent by the total cost of rental equipment, excluding accessory equipment, and new equipment inventory. The Average utilization for the period is calculated using the average costs of rental equipment.

[2] The financial results of Adler Tanks included in this table are through the date of the business divestiture, which occurred on February 1, 2023.

[3] Gross Enviroplex sales revenues were $11,597 and $16,401 for the nine months ended September 30, 2023 and 2022, respectively. There were $218 inter-segment sales to Mobile Modular in the nine months ended September 30, 2023 and $856 inter-segment sales during the same period in 2022, which required elimination in consolidation.