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Savings Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Savings Plan [Line Items] |  |  |
Savings plan maximum percentage of employees contribution allowable | 20.00% |  |
Percentage of employer contributions vested per year | 25.00% |  |
Maximum employment period considered for vesting of employers' contribution, in years | 4 |  |
U.S. Qualified Pension Plan |  |  |
Savings Plan [Line Items] |  |  |
Maximum percentage of matching contributions made by the employer | 100.00% | 100.00% | 100.00%
Percentage of employer match on employee contribution | 4.00% | 4.00% | 4.00%
Savings Plan |  |  |
Savings Plan [Line Items] |  |  |
Amounts charged to statement of operations | 10.6 | 11.3 | 7.5

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- Definition Maximum percentage of matching contributions made by the employer + References No definition available. + Details
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- Definition Percentage of employer contributions vested per year + References No definition available. + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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