Debt - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	May 09, 2016	Dec. 14, 2015
Debt Instrument [Line Items]
Credit Agreement, borrowing capacity	$ 610,200,000
Credit Agreement, interest rate terms	Outstanding amounts under the Credit Agreement bear interest at our option at either: (i) the London interbank offered rate (“LIBOR”) plus an applicable margin (“LIBOR Loans”), or (ii) the prime rate plus an applicable margin (“Base Rate Loans”).
Additional borrowing available under credit agreement	$ 386,400,000
Line of credit, covenant	The Credit Agreement also contains customary negative covenants, including covenants that restrict or limit the Company’s ability to, among other things: (i) allow certain liens to attach to the Company’s or its subsidiaries’ assets, (ii) repurchase or pay dividends or make certain other restricted payments on capital stock and certain other securities, or prepay certain indebtedness, (iii) incur additional indebtedness or engage in certain other types of financing transactions, and (iv) make acquisitions or other investments.
Line of credit facility, covenant compliance	In addition, we must comply with a minimum fixed charge coverage ratio of 1.00 to 1.00 as of the last day of each quarter, upon the minimum availability amount under the Credit Agreement falling below the greater of (y) $90 million and (z) 10% of the lesser of the then total revolving loan commitment and aggregate borrowing base.
Minimum fixed charges coverage ratio	100.00%
Line of credit, minimum borrowing availability for financial maintenance covenants to be applicable	$ 90,000,000
Applicable percentage of revolving loan commitment and aggregate borrowing base	10.00%
Obligations under capital leases	$ 61,853,000	$ 52,791,000
Maximum
Debt Instrument [Line Items]
Percentage of net orderly liquidation value of rental-fleet to be included in determination of borrowing base	90.00%
LIBOR Loans
Debt Instrument [Line Items]
Revolving credit facility, margin rate	1.50%
LIBOR Loans | Minimum
Debt Instrument [Line Items]
Revolving credit facility, margin rate	1.25%
LIBOR Loans | Maximum
Debt Instrument [Line Items]
Revolving credit facility, margin rate	1.75%
Base Rate Loans
Debt Instrument [Line Items]
Revolving credit facility, margin rate	0.50%
Base Rate Loans | Minimum
Debt Instrument [Line Items]
Revolving credit facility, margin rate	0.25%
Base Rate Loans | Maximum
Debt Instrument [Line Items]
Revolving credit facility, margin rate	0.75%
$1 billion ABL Credit Agreement
Debt Instrument [Line Items]
Credit Agreement, term	5 years
$1 billion ABL Credit Agreement | First Lien Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Credit Agreement, borrowing capacity				$ 1,000,000,000
Credit Agreement, maturity date	Dec. 14, 2020
U.S. Based Lenders | $1 billion ABL Credit Agreement | Standby Letters of Credit
Debt Instrument [Line Items]
Credit Agreement, borrowing capacity				50,000,000
U.K. Based Lenders | $1 billion ABL Credit Agreement | Standby Letters of Credit
Debt Instrument [Line Items]
Credit Agreement, borrowing capacity				20,000,000
Canadian Based Lenders | $1 billion ABL Credit Agreement | Standby Letters of Credit
Debt Instrument [Line Items]
Credit Agreement, borrowing capacity				$ 20,000,000
Senior Notes 5.875 Percent Due 2024
Debt Instrument [Line Items]
Senior notes, face amount	$ 250,000,000		$ 250,000,000
Senior notes, interest rate	5.875%
Senior notes, maturity term	8 years
Senior notes, maturity date	Jul. 01, 2024
Senior notes, interest payment term	Interest on the 2024 Notes is payable semiannually in arrears on January 1 and July 1.