Acquisition and Transition Costs, Special Charges and Intangible Asset Amortization (Detail) € in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
	Jul. 02, 2015 EUR (€)	Jul. 02, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Business Acquisition [Line Items]
Acquisition and Transition Costs			$ 917	$ 1,016	$ 1,401	$ 1,116
Special Charges			(139)	0	5,499	0
Investment Banking [Member]
Business Acquisition [Line Items]
Amortization of Intangible Assets			2,940	77	5,884	241
Investment Management [Member]
Business Acquisition [Line Items]
Amortization of Intangible Assets			$ 938	$ 1,486	$ 1,876	$ 3,250
Subsequent Event [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	100.00%
Payments to Acquire Businesses, Gross	€ 3,000	$ 3,335