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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Sep. 16, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Amortization of deferred finance costs		$ 0.4	$ 1.0	$ 0.7
Weighted average rate of interest on borrowings		2.20%	3.14%
Payments of interest on long-term debt		$ 0.8	$ 4.8	6.5
Net cash outflows in respect of refinancing costs		0.3	1.5	$ 0.0
Deferred finance costs, net		$ 1.3	$ 1.4
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Due date of revolving credit	Sep. 25, 2024	Sep. 25, 2023
Deferred finance costs capitalized	$ 0.3	$ 1.5

X

- Definition

Deferred​ finance costs ​asset net.

+ References

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- Definition

Deferred finance costs capitalized.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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-Publisher FASB
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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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