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Concentration Risk Schedule of Revenue Concentration (Details) - Revenue Concentration by Asset Class [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity assets [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	46.00%	45.00%	37.00%
Money market assets [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	33.00%	32.00%	39.00%
Fixed-income assets [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	21.00%	22.00%	23.00%

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- 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.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Topic 825
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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