Concentrations Of Risk (Schedule Of Major Customers, By Revenue Concentration) (Detail) (Customer Concentration Risk [Member], Continuing Operations [Member], Sales Revenue, Services, Net [Member], Ten Largest Customers [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Customer Concentration Risk [Member] | Continuing Operations [Member] | Sales Revenue, Services, Net [Member] | Ten Largest Customers [Member]
Concentration Risk [Line Items]
Revenues as a percent of total	73.00%	67.00%	69.00%	66.00%