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Debt - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Nov. 29, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Oct. 31, 2012
Debt Instrument [Line Items]
Capital lease obligations		$ 38,475,000		$ 38,736,000
Interest expense on notes due to affiliates		0	$ 14,737,000
Interest income for notes from affiliates		0	2,584,000
Affiliates
Debt Instrument [Line Items]
Interest expense on notes due to affiliates			14,700,000
Interest income for notes from affiliates			2,600,000
Line of Credit | ABL Facility
Debt Instrument [Line Items]
Letters of credit amount outstanding		$ 8,900,000		8,900,000
Senior Notes | Senior secured notes
Debt Instrument [Line Items]
Debt, face amount	$ 300,000,000.0
Interest rate	7.875%	7.875%
Unamortized debt issuance costs		$ 8,900,000		9,300,000
Senior Notes | Any Time Before November 29, 2019 | Senior secured notes | 100% of Principal
Debt Instrument [Line Items]
Redemption Price		100.00%
Make whole premium percentage of outstanding principal		100.00%
Make whole premium basis spread on variable rate		0.50%
Senior Notes | Any Time Before November 29, 2019 | Senior secured notes | 40% of Principal
Debt Instrument [Line Items]
Redemption Price		107.875%
Redemption percentage of aggregate principal amount		40.00%
Senior Notes | Any Time Before November 29, 2019 | Senior secured notes | 10% of Principal
Debt Instrument [Line Items]
Redemption Price		103.00%
Redemption percentage of aggregate principal amount		10.00%
Capital Leases and Other Financing Obligations
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 1,700,000		1,800,000
Capital Lease Obligations
Debt Instrument [Line Items]
Capital lease obligations		$ 200,000		200,000
Capital Lease Obligations | Minimum
Debt Instrument [Line Items]
Interest rate		1.20%
Capital Lease Obligations | Maximum
Debt Instrument [Line Items]
Interest rate		11.90%
Sale Leaseback Transaction
Debt Instrument [Line Items]
Capital lease obligations		$ 38,300,000		38,500,000
Implicit interest rate		8.00%
Sale Leaseback Transaction | Minimum
Debt Instrument [Line Items]
Agreement term		18 months
Sale Leaseback Transaction | Maximum
Debt Instrument [Line Items]
Agreement term		10 years
Revolving Credit Facility | Line of Credit | Former Algeco Group Revolver
Debt Instrument [Line Items]
Maximum aggregate availability					$ 1,355,000,000.000
Interest expense			$ 6,200,000
Revolving Credit Facility | Line of Credit | Former Algeco Group Revolver Denominated in USD
Debt Instrument [Line Items]
Maximum aggregate availability					760,000,000.0
Revolving Credit Facility | Line of Credit | Former Algeco Group Revolver Denominated in CAD
Debt Instrument [Line Items]
Maximum aggregate availability					$ 175,000,000.0
Revolving Credit Facility | Line of Credit | ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability	$ 600,000,000.0	$ 600,000,000.0		600,000,000.0
Accordion feature	$ 300,000,000.0
Applicable margin, step down	0.25%
Applicable margin, step up	0.25%
Weighted average interest rate for borrowings	4.35%	4.35%
Available borrowing capacity		$ 243,800,000		281,100,000
Minimum fixed charge ratio		1.00
Maximum total net leverage ratio		5.50
Excess availability under facility to trigger covenant		$ 50,000,000.0
Excess availability as a percentage of the line cap to trigger covenant		10.00%
Outstanding principal		$ 347,300,000		310,000,000
Debt issuance costs and debt discount		12,700,000		12,700,000
Revolving Credit Facility | Line of Credit | ABL Facility | Minimum
Debt Instrument [Line Items]
Commitment fee	0.375%
Revolving Credit Facility | Line of Credit | ABL Facility | Maximum
Debt Instrument [Line Items]
Commitment fee	0.50%
Revolving Credit Facility | Line of Credit | US ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability	$ 530,000,000.0
Percentage of net book value of accounts receivable used in determining borrowing capacity	85.00%
Percentage of net book value of eligible rental equipment used in determining borrowing capacity	95.00%
Percentage of net orderly liquidation value of eligible rental equipment used in determining borrowing capacity	85.00%
Available borrowing capacity		174,600,000		211,100,000
Revolving Credit Facility | Line of Credit | Canadian ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability	$ 70,000,000.0
Percentage of net book value of accounts receivable used in determining borrowing capacity	85.00%
Percentage of net book value of eligible rental equipment used in determining borrowing capacity	95.00%
Percentage of net orderly liquidation value of eligible rental equipment used in determining borrowing capacity	85.00%
Available borrowing capacity		69,200,000		$ 70,000,000
Outstanding principal		800,000
Unamortized debt issuance costs		$ 1,600,000
Revolving Credit Facility | Line of Credit | LIBOR | ABL Facility
Debt Instrument [Line Items]
Applicable margin	2.50%
Revolving Credit Facility | Line of Credit | Base Rate | ABL Facility
Debt Instrument [Line Items]
Applicable margin	1.50%
Letter of Credit | Line of Credit | ABL Facility
Debt Instrument [Line Items]
Commitment fee		2.625%		2.625%
Letter of Credit | Line of Credit | US ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability		$ 60,000,000.0
Letter of Credit | Line of Credit | Canadian ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability		30,000,000.0
Swingline Loans | Line of Credit | US ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability		50,000,000.0
Swingline Loans | Line of Credit | Canadian ABL Facility
Debt Instrument [Line Items]
Maximum aggregate availability		$ 25,000,000.0

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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