Concentrations Of Risk (Schedule Of Major Customers, By Revenue Concentration) (Detail) (Segment, Continuing Operations [Member], Customer Concentration Risk [Member], Ten Largest Customers [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment, Continuing Operations [Member] | Customer Concentration Risk [Member] | Ten Largest Customers [Member]
Concentration Risk [Line Items]
Revenues as a percent of total	70.00%	69.00%	68.00%	68.00%