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Details of Movement in Restructuring Provisions Recognized (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | $ 9,033 | $ 4,525 | $ 9,817
Cash payments | (6,743) |  |
Amounts released | (93) |  |
Foreign exchange movement | (3) |  |
Closing provision | 2,194 |  |
1st Quarter 2013 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 4,412 |  |
2nd Quarter 2013 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 4,621 |  |
Restructuring - Fiscal 2012 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized |  | 4,644 |
Residual balance from prior period |  | 130 |
Cash payments | (623) | (3,854) |
Amounts released | (57) |  |
Foreign exchange movement |  | (4) |
Closing provision | 236 | 916 |
Workforce Reduction |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 8,131 |  |
Cash payments | (6,544) |  |
Amounts released | (93) |  |
Foreign exchange movement | (3) |  |
Closing provision | 1,491 |  |
Workforce Reduction | 1st Quarter 2013 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 3,903 |  |
Workforce Reduction | 2nd Quarter 2013 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 4,228 |  |
Workforce Reduction | Restructuring - Fiscal 2012 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized |  | 3,394 |
Cash payments | (197) | (3,030) |
Amounts released | (57) |  |
Foreign exchange movement |  | (4) |
Closing provision | 106 | 360 |
Office Consolidations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 902 |  |
Cash payments | (199) |  |
Closing provision | 703 |  |
Office Consolidations | 1st Quarter 2013 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 509 |  |
Office Consolidations | 2nd Quarter 2013 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized | 393 |  |
Office Consolidations | Restructuring - Fiscal 2012 Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Initial provision recognized |  | 1,250 |
Residual balance from prior period |  | 130 |
Cash payments | (426) | (824) |
Closing provision | $ 130 | $ 556 |

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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 any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments. + References Reference 1: 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 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)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394291&loc=d3e17658-110867 + 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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