Subsequent events (Details) - 2021 Senior Secured Credit Facility - Subsequent Event	Apr. 30, 2021 USD ($)
Letter of Credit
Subsequent Event [Line Items]
Debt instrument, term	5 years
Amounts available under senior secured credit facility	$ 200,000,000.0
Unused fee rate (percentage)	0.15%
Line of credit facility, periodic payment	$ 1,250,000
Letter of Credit \| LIBOR
Subsequent Event [Line Items]
Variable rate floor (percentage)	0.00%
Basis spread on interest rate (percentage)	1.375%
Letter of Credit \| Base Rate
Subsequent Event [Line Items]
Basis spread on interest rate (percentage)	0.375%
Revolving credit facility
Subsequent Event [Line Items]
Amounts available under senior secured credit facility	$ 100,000,000
Net leverage ratio	3.25
Fixed charge coverage ratio	1.15
Term loan
Subsequent Event [Line Items]
Amounts available under senior secured credit facility	$ 100,000,000
Minimum \| Letter of Credit
Subsequent Event [Line Items]
Unused fee rate (percentage)	0.10%
Minimum \| Letter of Credit \| LIBOR
Subsequent Event [Line Items]
Basis spread on interest rate (percentage)	1.25%
Minimum \| Letter of Credit \| Base Rate
Subsequent Event [Line Items]
Basis spread on interest rate (percentage)	0.25%
Maximum \| Letter of Credit
Subsequent Event [Line Items]
Unused fee rate (percentage)	0.30%
Maximum \| Letter of Credit \| LIBOR
Subsequent Event [Line Items]
Basis spread on interest rate (percentage)	2.125%
Maximum \| Letter of Credit \| Base Rate
Subsequent Event [Line Items]
Basis spread on interest rate (percentage)	1.125%

Debt Instrument, Fixed Charge Coverage Ratio

No definition available.

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- Definition

Debt Instrument, Net Leverage Ratio

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Unused Fee Rate

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Variable Rate Floor

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Period Type:	instant

- Definition

Amount of the required periodic payments of both interest and principal.

+ References

+ Details

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Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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