Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011 Proficient	Jun. 30, 2012 Business	Dec. 31, 2011 Business Proficient	Jun. 30, 2012 Consumer	Dec. 31, 2011 Consumer	Dec. 31, 2011 Consumer Proficient	Dec. 31, 2010 Consumer Proficient
Goodwill [Line Items]
Beginning Balance	$ 24,090	$ 24,015	$ 16,066	$ 15,991	$ 8,024	$ 8,024	$ 8,024	$ 8,024
Look.io acquisition (see Note 3)	1,082		1,082
Contingent earnout payments (see Note 3)	77	75	77	75
Ending Balance	$ 25,249	$ 24,090	$ 17,225	$ 16,066	$ 8,024	$ 8,024	$ 8,024	$ 8,024

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details