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Details of Movement in Restructuring Provisions Recognized (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Mar. 31, 2013 1st Quarter 2013 Restructuring Plan | Jun. 30, 2013 1st Quarter 2013 Restructuring Plan | Jun. 30, 2013 2nd Quarter 2013 Restructuring Plan | Jun. 30, 2013 2nd Quarter 2013 Restructuring Plan | Jun. 30, 2013 Restructuring - Fiscal 2012 Plan | Dec. 31, 2012 Restructuring - Fiscal 2012 Plan | Jun. 30, 2013 Workforce Reduction | Jun. 30, 2013 Workforce Reduction 1st Quarter 2013 Restructuring Plan | Jun. 30, 2013 Workforce Reduction 2nd Quarter 2013 Restructuring Plan | Jun. 30, 2013 Workforce Reduction Restructuring - Fiscal 2012 Plan | Dec. 31, 2012 Workforce Reduction Restructuring - Fiscal 2012 Plan | Jun. 30, 2013 Office Consolidations | Jun. 30, 2013 Office Consolidations 1st Quarter 2013 Restructuring Plan | Jun. 30, 2013 Office Consolidations 2nd Quarter 2013 Restructuring Plan | Jun. 30, 2013 Office Consolidations Restructuring - Fiscal 2012 Plan | Dec. 31, 2012 Office Consolidations Restructuring - Fiscal 2012 Plan
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial provision recognized | $ 4,621 | $ 4,525 | $ 9,033 | $ 4,525 | $ 4,500 | $ 4,400 | $ 4,412 | $ 4,600 | $ 4,621 |  | $ 4,644 | $ 8,131 | $ 3,903 | $ 4,228 |  | $ 3,394 | $ 902 | $ 509 | $ 393 |  | $ 1,250
Cash payments |  |  | (4,369) |  |  |  |  |  |  | (623) | (3,854) | (4,280) |  |  | (197) | (3,030) | (89) |  |  | (426) | (824)
Foreign exchange movement |  |  | (3) |  |  |  |  |  |  |  | (4) | (3) |  |  |  | (4) |  |  |  |  |
Provision balance at end of period | $ 4,661 |  | $ 4,661 |  |  |  |  |  |  | $ 163 | $ 786 | $ 3,848 |  |  | $ 163 | $ 360 | $ 813 |  |  |  | $ 426

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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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- Definition Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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