This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

No definition available.

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair Value Measurements - Additional Information (Details) - Level III [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Institutional Asset Management [Member] \| Goodwill [Member]
Fair Value Measurements, Nonrecurring [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 66,200
Atalanta Sosnoff [Member] \| Equity Method Investments [Member]
Fair Value Measurements, Nonrecurring [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 14,730