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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.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Summary of Changes in Restructuring-Related Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Costs Incurred	$ 14,732us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges
Accrued restructuring costs \| Current accrued restructuring costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Costs Incurred	14,732
Cash Payments	(12,008)
Non-cash Settlements	(441)
Adjustments and Other	1
Ending Balance	2,284
Accrued restructuring costs \| Current accrued restructuring costs \| Severance and related employee benefits
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Costs Incurred	13,162
Cash Payments	(10,746)
Non-cash Settlements	0
Adjustments and Other	(201)
Ending Balance	2,215
Accrued restructuring costs \| Current accrued restructuring costs \| Contract termination costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Costs Incurred	1,159
Cash Payments	(960)
Non-cash Settlements	(441)
Adjustments and Other	242
Ending Balance	0
Accrued restructuring costs \| Current accrued restructuring costs \| Other costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Costs Incurred	411
Cash Payments	(302)
Non-cash Settlements	0
Adjustments and Other	(40)
Ending Balance	$ 69