Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance	$ 2,030	$ 1,561
Restructuring charges	5,057	8,051	2,048
Acquired lease obligation	128
Cash payments	(5,277)	(5,376)
Non-cash write-offs or other adjustments	(389)	(2,206)
Accrued expense ending balance	1,549	2,030	1,561
Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance	1,304	470
Restructuring charges	2,549	3,314
Cash payments	(2,958)	(2,419)
Non-cash write-offs or other adjustments	(95)	(61)
Accrued expense ending balance	800	1,304
Facility
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance	489	1,062
Restructuring charges	1,176	967
Acquired lease obligation	128
Cash payments	(1,165)	(1,301)
Non-cash write-offs or other adjustments	15	(239)
Accrued expense ending balance	643	489
Accelerated Depreciation and Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	190	1,892
Non-cash write-offs or other adjustments	(190)	(1,892)
Other Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance	237	29
Restructuring charges	1,142	1,878
Cash payments	(1,154)	(1,656)
Non-cash write-offs or other adjustments	(119)	(14)
Accrued expense ending balance	$ 106	$ 237