Business Description, Organization and Basis of Presentation (Details) - shares	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Distribution Made to Limited Partner [Line Items]
AXA and its subsidiaries ownership interest in Holding company (percent)	2.70%
Units outstanding (in shares)	100,000	100,000
General partnership interest (percent)	1.00%
Limited partners or members ownership interest in Company (percent)	100.00%
AXA and its subsidiaries economic interest in Company (percent)	64.90%
AXA and its subsidiaries
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	64.00%
AB Holding
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	34.90%
Unaffiliated holders
Distribution Made to Limited Partner [Line Items]
Limited partners or members ownership interest in Company (percent)	1.10%