Goodwill and Intangible Assets, Net - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 51,041	$ 159,667
Accumulated Amortization	(32,959)	(75,629)
Impairment	(6,735)
Net Carrying Amount	11,347	84,038
Intangible assets reclassified to assets held for sale	53,989
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	29,141	133,067
Accumulated Amortization	(23,769)	(64,238)
Impairment	0
Net Carrying Amount	5,372	68,829
Institutional Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,900	16,600
Accumulated Amortization	(5,222)	(8,468)
Impairment	(6,340)
Net Carrying Amount	338	8,132
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,000	10,000
Accumulated Amortization	(3,968)	(2,923)
Impairment	(395)
Net Carrying Amount	$ 5,637	$ 7,077