Purchase Price Allocation (Detail) (Amba, USD $) In Millions, unless otherwise specified	Dec. 11, 2013
Business Acquisition [Line Items]
Current assets	$ 23.7
Property and equipment, net	0.4
Total intangible assets	31.6
Goodwill	29.2
Indemnification asset	10.4
Other assets	2.0
Liabilities assumed	(25.7)
Net assets acquired	71.6
Trade names
Business Acquisition [Line Items]
Total intangible assets	3.3
Client relationships
Business Acquisition [Line Items]
Total intangible assets	26.7
Other intangibles
Business Acquisition [Line Items]
Total intangible assets	$ 1.6