Aggregate Preliminary Purchase Price Allocation to Assets Acquired and Liabilities Assumed in Acquisition (Parenthetical) (Detail) (Ideas International Limited, USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Ideas International Limited
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Goodwill	$ 7.5
Amortizable intangible assets	$ 8.4