Utilization of Components of the Accrued Exit Costs (Detail) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Exit Costs Beginning Balance	$ 5,960
Amount provided for the Three Months Ended	(619)
Amount Utilized for the Three Months Ended	(774)
Exit Costs Ending Balance	4,567
Contract Termination
Restructuring Cost and Reserve [Line Items]
Exit Costs Beginning Balance	5,960
Amount provided for the Three Months Ended	(724)
Amount Utilized for the Three Months Ended	(669)
Exit Costs Ending Balance	4,567
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Amount provided for the Three Months Ended	105
Amount Utilized for the Three Months Ended	$ (105)