Summary of Restructuring Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 1,675	$ 2,129
Liabilities recognized		219
Payments	(528)	(673)
Restructuring reserve, ending balance	1,147	1,675
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	382	604
Payments	(118)	(222)
Restructuring reserve, ending balance	264	382
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	1,293	1,525
Liabilities recognized		219
Payments	(410)	(451)
Restructuring reserve, ending balance	$ 883	$ 1,293