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Summary of Major Types of Costs, Cumulative Costs Incurred and Total Cost Expected Associated With Restructuring Activities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 85us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges
Operating expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	85	0
Cumulative Costs Incurred To Date	14,817
Total Expected Plan Costs	15,013
Operating expenses \| Severance and related employee benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	0
Cumulative Costs Incurred To Date	13,162
Total Expected Plan Costs	13,162
Operating expenses \| Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	0
Cumulative Costs Incurred To Date	1,159
Total Expected Plan Costs	1,159
Operating expenses \| Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	85	0
Cumulative Costs Incurred To Date	496
Total Expected Plan Costs	$ 692

- 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