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Balance Sheet Information - Summary of Changes in Accrued Restructuring Costs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 1,266us-gaap_RestructuringReserveCurrent
Restructuring charges	1,047us-gaap_RestructuringCharges
Payments	(408)us-gaap_PaymentsForRestructuring
Adjustments to estimated obligations	456
Change in fair value	11
Ending balance	2,372us-gaap_RestructuringReserveCurrent
Facility Leases [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,266
Restructuring charges	139
Payments	(191)
Adjustments to estimated obligations	456
Change in fair value	11
Ending balance	1,681
Severance and Related [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	0
Restructuring charges	598
Payments	(217)
Adjustments to estimated obligations	0
Change in fair value	0
Ending balance	381
Contract [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	0
Restructuring charges	310
Payments	0
Adjustments to estimated obligations	0
Change in fair value	0
Ending balance	$ 310

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details