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Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 27, 2017	Mar. 31, 2017	Dec. 31, 2016	Nov. 18, 2016
Subsequent Event [Line Items]
Cost method investments		$ 20,000	$ 20,000
Advisor Engine Inc. [Member]
Subsequent Event [Line Items]
Cost method investments				$ 20,000
Ownership interest percentage		42.00%
Fully diluted ownership interest percentage		36.00%
Advisor Engine Inc. [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Cost method investments	$ 5,000
Ownership interest percentage	47.00%
Fully diluted ownership interest percentage	41.00%
Advisor Engine Inc. [Member] | Series A- One Convertible Preferred Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of shares received	2,646,062

X

- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Definition

Fully diluted ownership interest percentage.

+ References

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X

- Definition

Number of shares purchased from related parties.

+ References

No definition available.

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- Definition

Percentage of ownership interest related parties.

+ References

No definition available.

+ Details

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