Acquisitions, Goodwill and Intangible Assets - Additional Information (Detail)	12 Months Ended							1 Months Ended	0 Months Ended
	Dec. 31, 2013 USD ($) Segment	Dec. 31, 2012 USD ($)	Dec. 31, 2013 Private Equity USD ($)	Dec. 31, 2013 Real Estate USD ($)	Dec. 31, 2013 Hedge Fund Solutions USD ($)	Dec. 31, 2013 Credit USD ($)	Dec. 31, 2013 Financial Advisory USD ($)	Aug. 05, 2013 Strategic Partners Fund Solutions USD ($)	Jan. 05, 2012 Harbourmaster USD ($)	Jan. 05, 2012 Harbourmaster EUR (€)
Business Acquisition [Line Items]
Increase in goodwill								$ 83,800,000
Increase in intangible assets								57,900,000
Purchase price in cash									232,044,000	181,400,000
Acquisition-related costs	2,100,000
Number of business segments	5
Goodwill, carrying value	1,787,392,000	1,703,602,000	778,300,000	421,700,000	172,100,000	346,400,000	68,900,000
Expected amortization of intangibles, 2014	102,300,000
Expected amortization of intangibles, 2015	95,800,000
Expected amortization of intangibles, 2016	85,600,000
Expected amortization of intangibles, 2017	46,500,000
Expected amortization of intangibles, 2018	$ 46,500,000
Intangible assets expected to amortize over a weighted-average period	7 years 4 months 24 days