Commitments and Contingencies - Future Minimum Payments Under Non-Cancelable Leases, Sublease Commitments and Related Payments (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Payments
2022	$ 100,604
2023	97,049
2024	99,259
2025	33,060
2026	32,047
2027 and thereafter	169,074
Total lease payments	531,093
Real Estate
Payments
2022	107,100
2023	99,400
2024	100,700
2025	51,600
2026	49,900
2027 and thereafter	528,300
Total lease payments	937,000
Sublease Receipts
2022	(31,200)
2023	(31,600)
2024	(30,700)
2025	0
2026	0
2027 and thereafter	0
Total future minimum payments	(93,500)
Net Payments
2022	75,900
2023	67,800
2024	70,000
2025	51,600
2026	49,900
2027 and thereafter	528,300
Total future minimum payments	$ 843,500

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due After Year Five

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- Definition

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due Year Five

+ References

No definition available.

+ Details

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- Definition

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due Year Four

+ References

No definition available.

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- Definition

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due Year Three

+ References

No definition available.

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- Definition

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Due Year Two

+ References

No definition available.

+ Details

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- Definition

Lessee, Operating Lease, Liability, Payments, Net Of Sublease Income, Remainder Of Fiscal Year

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The total of net future contractually required payments on leases defined as operating.

+ References

No definition available.

+ Details

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Namespace Prefix:	ablp_
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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating 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=123408670&loc=SL77918701-209980

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981

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Balance Type:	debit
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- Definition

Amount of lease payment to be received by lessor for operating lease in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Period Type:	instant

- Definition

Amount of lease payment to be received by lessor for operating lease in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Period Type:	instant

- Definition

Amount of lease payment to be received by lessor for operating lease in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of lease payment to be received by lessor for operating lease after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- Definition

Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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Period Type:	instant

- Definition

Amount of lease payment to be received by lessor for operating lease in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

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- References

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