Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues	$ 149,040	$ 149,661
Costs and expenses:
Depreciation and amortization	17,492	17,335
Total costs and expenses	124,852	114,171
Income from operations	24,188	35,490
Interest expense, net of interest income	9,245	10,760
Income tax provision (benefit)	6,639	6,523
Capital expenditures for additions to rental fleet, excluding acquisitions	10,051	23,016
Storage Solutions
Revenues:
Revenues	121,989	118,727
Costs and expenses:
Depreciation and amortization	11,075	10,723
Total costs and expenses	99,296	87,165
Income from operations	22,693	31,562
Interest expense, net of interest income	6,569	8,065
Income tax provision (benefit)	7,026	6,159
Capital expenditures for additions to rental fleet, excluding acquisitions	5,537	12,762
Storage Solutions | North America
Revenues:
Revenues	101,792	97,767
Costs and expenses:
Depreciation and amortization	9,305	8,989
Total costs and expenses	83,654	70,358
Income from operations	18,138	27,409
Interest expense, net of interest income	6,462	7,930
Income tax provision (benefit)	6,251	5,395
Capital expenditures for additions to rental fleet, excluding acquisitions	5,200	11,841
Storage Solutions | United Kingdom
Revenues:
Revenues	20,197	20,960
Costs and expenses:
Depreciation and amortization	1,770	1,734
Total costs and expenses	15,642	16,807
Income from operations	4,555	4,153
Interest expense, net of interest income	107	135
Income tax provision (benefit)	775	764
Capital expenditures for additions to rental fleet, excluding acquisitions	337	921
Tank & Pump Solutions Segment
Revenues:
Revenues	27,051	30,934
Costs and expenses:
Depreciation and amortization	6,417	6,612
Total costs and expenses	25,556	27,006
Income from operations	1,495	3,928
Interest expense, net of interest income	2,676	2,695
Income tax provision (benefit)	(387)	364
Capital expenditures for additions to rental fleet, excluding acquisitions	4,514	10,254
Rental
Revenues:
Revenues	140,656	142,172
Rental | Storage Solutions
Revenues:
Revenues	114,744	112,725
Rental | Storage Solutions | North America
Revenues:
Revenues	96,469	93,516
Rental | Storage Solutions | United Kingdom
Revenues:
Revenues	18,275	19,209
Rental | Tank & Pump Solutions Segment
Revenues:
Revenues	25,912	29,447
Sales
Revenues:
Revenues	8,316	7,223
Costs and expenses:
Cost of sales	5,102	4,602
Sales | Storage Solutions
Revenues:
Revenues	7,206	5,777
Costs and expenses:
Cost of sales	4,538	3,816
Sales | Storage Solutions | North America
Revenues:
Revenues	5,284	4,026
Costs and expenses:
Cost of sales	3,061	2,413
Sales | Storage Solutions | United Kingdom
Revenues:
Revenues	1,922	1,751
Costs and expenses:
Cost of sales	1,477	1,403
Sales | Tank & Pump Solutions Segment
Revenues:
Revenues	1,110	1,446
Costs and expenses:
Cost of sales	564	786
Other
Revenues:
Revenues	68	266
Other | Storage Solutions
Revenues:
Revenues	39	225
Other | Storage Solutions | North America
Revenues:
Revenues	39	225
Other | Tank & Pump Solutions Segment
Revenues:
Revenues	29	41
Rental Selling and General Expenses
Costs and expenses:
Cost of sales	102,258	92,234
Rental Selling and General Expenses | Storage Solutions
Costs and expenses:
Cost of sales	83,683	72,626
Rental Selling and General Expenses | Storage Solutions | North America
Costs and expenses:
Cost of sales	71,288	58,956
Rental Selling and General Expenses | Storage Solutions | United Kingdom
Costs and expenses:
Cost of sales	12,395	13,670
Rental Selling and General Expenses | Tank & Pump Solutions Segment
Costs and expenses:
Cost of sales	$ 18,575	$ 19,608