Organization Pending Merger and Bases of Presentation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 27, 2012	Jun. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Organization, Consolidation and Presentation of Financial Statements Disclosure
Business acquisition common stock purchase price per share		$ 28.00	$ 28.00
Termination fees and expenses		$ 37.0	$ 37.0
Cumulative liability including income tax, interest and penalties				14.5
Voluntary payment of outstanding taxes to Australian Tax Office ("ATO")	6.6
Tax penalties reduced		(1.3)
contingent upon the closing of the pending merger transaction with Dell
Organization, Consolidation and Presentation of Financial Statements Disclosure
Expected additional fees and expenses through calendar year 2012 including transaction fees payable to the financial advisor			$ 22