Summary of the Exit Costs (Detail) (USD $) In Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Total Amount Expected to be Incurred	$ 7,500
Amount Incurred during the period	377	7,035
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Total Amount Expected to be Incurred	6,400
Amount Incurred during the period	111	6,152
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Total Amount Expected to be Incurred	1,100
Amount Incurred during the period	$ 266	$ 883