Barrie and Hibbert, Limited, Purchase Price Allocation (Detail) (Barrie & Hibbert Limited, USD $) In Millions, unless otherwise specified	Dec. 16, 2011
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Current assets	$ 15.2
Property and equipment, net	0.7
Total intangible assets	27.1
Goodwill	54.6
Liabilities assumed	(18.1)
Net assets acquired	79.5
Trade names
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Total intangible assets	1.9
Client relationships
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Total intangible assets	8.3
Software
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Total intangible assets	16.8
Other intangibles
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Total intangible assets	$ 0.1