Restructuring and Related Charges (Detail) - Restructuring accrual activity (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accrual	$ 606	$ 1,969
Charges (credits) to expense	395	116
Cash Payments	(269)	(1,479)
Accrual	732	606
Severance and other termination costs [Member]
Accrual	57	1,239
Charges (credits) to expense	17	64
Cash Payments	(74)	(1,246)
Accrual		57
Other Cost [Member]
Accrual	50	730
Charges (credits) to expense	(40)	(447)
Cash Payments	(10)	(233)
Accrual		50
Lease Obligations [Member]
Accrual	499
Charges (credits) to expense	418	499
Cash Payments	(185)
Accrual	$ 732	$ 499