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Restructuring Charges - Schedule of Changes in Lease Termination Related Restructuring Reserves (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost And Reserve [Line Items] |  |  |
Current year charges | $ 10,543 us-gaap_RestructuringCharges | $ 10,938 us-gaap_RestructuringCharges | $ 2,460 us-gaap_RestructuringCharges
Lease Termination Restructuring Reserves [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Accrued costs, beginning of period | 3,506 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 2,335 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 3,674 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Current year charges | 1,332 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 5,202 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 1,887 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Payments | (3,444)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | (4,031)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | (3,226)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Accrued costs, end of period | $ 1,394 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | $ 3,506 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | $ 2,335 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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