Deferred Sales Commissions, Net - Schedule of Future Amortization Expense (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
2019	$ 9,675
2020	4,561
2021	2,608
2022	237
2023	51
2024	16
Total	$ 17,148

The amount of amortization expense expected to be recognized during year five of the six succeeding fiscal years.

No definition available.

Name:	ablp_DeferredSalesCommissionFutureAmortizationExpenseYearFive
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year four of the six succeeding fiscal years.

No definition available.

Name:	ablp_DeferredSalesCommissionFutureAmortizationExpenseYearFour
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year one of the six succeeding fiscal years.

No definition available.

Name:	ablp_DeferredSalesCommissionFutureAmortizationExpenseYearOne
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year six of the six succeeding fiscal years.

No definition available.

Name:	ablp_DeferredSalesCommissionFutureAmortizationExpenseYearSix
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year three of the six succeeding fiscal years.

No definition available.

Name:	ablp_DeferredSalesCommissionFutureAmortizationExpenseYearThree
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of amortization expense expected to be recognized during year two of the six succeeding fiscal years.

No definition available.

Name:	ablp_DeferredSalesCommissionFutureAmortizationExpenseYearTwo
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate estimated amortization expense for succeeding fiscal years for deferred sales commissions subject to amortization.

No definition available.

Name:	ablp_DeferredSalesCommissionsFutureAmortizationExpense
Namespace Prefix:	ablp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

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