Represents the floating rate on debt prior to conversion to a fixed rate basis.

No definition available.

Name:	atr_FloatingInterestRatePriorToConversionToFixedInterestRate
Namespace Prefix:	atr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the entity's interest coverage ratio for use in determining compliance with debt covenants.

+ References

No definition available.

+ Details

Name:	atr_InterestCoverageRatioOfDebt
Namespace Prefix:	atr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the entity's leverage ratio for use in determining compliance with debt covenants.

+ References

No definition available.

+ Details

Name:	atr_LeverageRatioOfDebt
Namespace Prefix:	atr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: 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(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as current.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, including portion classified as current.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes3.2PercentDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes3.5PercentDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes0.98DueIn2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes3.4PercentDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes3.5PercentDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes1.17DueIn2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes3.6PercentDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atr_SeniorUnsecuredNotes3.6PercentDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEBT - Long-Term Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2017
Components of the company's debt obligations
Finance Lease Liabilities	$ 32,021	$ 30,025
Unamortized debt issuance costs	(1,374)	(1,663)
Long-term debt and lease obligation, including current maturities	1,116,171	1,120,664
Current maturities of long-term obligations	(67,243)	(65,666)
Total long-term obligations	$ 1,048,928	1,054,998
Consolidated Leverage Ratio	1.49
Consolidated Interest Coverage Ratio	18.93
Minimum
Components of the company's debt obligations
Consolidated Interest Coverage Ratio	3.00
Maximum
Components of the company's debt obligations
Consolidated Leverage Ratio	3.50
Notes payable 0.00% – 10.91%, due in monthly and annual installments through 2028
Components of the company's debt obligations
Long-term debt, gross	$ 17,754	14,002
Notes payable 0.00% – 10.91%, due in monthly and annual installments through 2028 \| Minimum
Components of the company's debt obligations
Interest rate on notes (as a percent)	0.00%
Notes payable 0.00% – 10.91%, due in monthly and annual installments through 2028 \| Maximum
Components of the company's debt obligations
Interest rate on notes (as a percent)	10.91%
Senior unsecured notes 3.2%, due in 2022
Components of the company's debt obligations
Long-term debt, gross	$ 75,000	75,000
Interest rate on notes (as a percent)	3.20%
Senior unsecured debts 1.4% USD floating swapped to 1.36% EUR fixed, equal annual installments through 2022
Components of the company's debt obligations
Long-term debt, gross	$ 112,000	112,000
Interest rate on notes (as a percent)	1.36%		1.36%
Floating interest rate prior to conversion to a fixed interest rate (as a percent)	1.40%
Senior unsecured notes 3.5%, due in 2023
Components of the company's debt obligations
Long-term debt, gross	$ 125,000	125,000
Interest rate on notes (as a percent)	3.50%
Senior unsecured notes 1.0%, due in 2023
Components of the company's debt obligations
Long-term debt, gross	$ 118,590	122,100
Interest rate on notes (as a percent)	1.00%
Senior unsecured notes 3.4%, due in 2024
Components of the company's debt obligations
Long-term debt, gross	$ 50,000	50,000
Interest rate on notes (as a percent)	3.40%
Senior unsecured notes 3.5%, due in 2024
Components of the company's debt obligations
Long-term debt, gross	$ 100,000	100,000
Interest rate on notes (as a percent)	3.50%
Senior unsecured notes 1.2%, due in 2024
Components of the company's debt obligations
Long-term debt, gross	$ 237,180	244,200
Interest rate on notes (as a percent)	1.20%
Senior unsecured notes 3.6%, due in 2025
Components of the company's debt obligations
Long-term debt, gross	$ 125,000	125,000
Interest rate on notes (as a percent)	3.60%
Senior unsecured notes 3.6%, due in 2026
Components of the company's debt obligations
Long-term debt, gross	$ 125,000	$ 125,000
Interest rate on notes (as a percent)	3.60%