Purchase Price Allocation (Parenthetical) (Detail)	0 Months Ended
	Nov. 04, 2011 Copal Partners Trade names	Nov. 04, 2011 Copal Partners Client relationships	Nov. 04, 2011 Copal Partners Other intangibles	Nov. 04, 2011 Copal Partners Total Intangible Assets	Dec. 16, 2011 Barrie & Hibbert Limited Trade names	Dec. 16, 2011 Barrie & Hibbert Limited Client relationships	Dec. 16, 2011 Barrie & Hibbert Limited Software	Dec. 16, 2011 Barrie & Hibbert Limited Other intangibles	Dec. 16, 2011 Barrie & Hibbert Limited Total Intangible Assets	Dec. 11, 2013 Amba Trade names	Dec. 11, 2013 Amba Client relationships	Dec. 11, 2013 Amba Other intangibles	Dec. 11, 2013 Amba Total Intangible Assets
Business Acquisition [Line Items]
Weighted average life of intangible assets acquired (in years)	15 years	16 years	2 years	15 years	5 years	18 years	7 years	2 years	12 years	7 years	12 years	3 years	11 years