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Acquisition - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
Acquisition - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition [Line Items]
Acquisition, net of cash acquired				$ 3,831,000
Gain on bargain purchase				2,022,000
Inmac [Member]
Business Acquisition [Line Items]
Acquisition, net of cash acquired				3,831,000
Gain on bargain purchase				$ 2,022,000

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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