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Restructuring - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Restructuring Cost and Reserve [Line Items] |  |  |
Pre-tax restructuring expenses related to restructuring initiative | $ 32,473,000 | $ 12,314,000 | $ 11,095,000
Restructuring liabilities | 10,887,000 | 5,875,000 | 3,543,000
2009 restructuring initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Pre-tax restructuring expenses related to restructuring initiative |  |  | 11,100,000
Number of employees |  |  | 700
Total restructuring costs related to restructuring initiative |  |  | 23,200,000
Restructuring liabilities |  |  | 3,543,000
2011 restructuring initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Pre-tax restructuring expenses related to restructuring initiative | 32,473,000 | 12,314,000 |
Number of employees | 491 | 292 |
Expected Severance payments period | 12 months |  |
Restructuring liabilities | $ 10,887,000 | $ 5,875,000 |

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- Definition Amount of costs incurred to date for the specified type of restructuring cost. + 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=6394695&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 + Details
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