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Plan of Restructuring (Detail) - Plan of Restructuring Segment (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Segmented Restructuring Balance	$ 182	$ 73
Segmented Restructuring Provision	173
Segmented Restructuring Payment and Other Adjustment	64
Digital Display Sales [Member]
Segmented Restructuring Balance	152
Segmented Restructuring Provision	152
Segmented Restructuring Payment and Other Adjustment
Digital Display Lease and Maintenance [Member]
Segmented Restructuring Balance	30	73
Segmented Restructuring Provision	21
Segmented Restructuring Payment and Other Adjustment	$ 64

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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