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Borrowings - Additional Information (Detail) | 12 Months Ended | 1 Months Ended | 6 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2012 USD ($) | Jun. 30, 2010 2.58% Senior Euro Notes USD ($) | Jun. 30, 2010 2.58% Senior Euro Notes EUR (€) | Jun. 30, 2012 2.58% Senior Euro Notes | Jun. 09, 2010 2.58% Senior Euro Notes USD ($) | Dec. 31, 2012 2.58% Senior Euro Notes Minimum | Dec. 31, 2010 4.5 % Senior Notes USD ($) | Dec. 06, 2010 4.5 % Senior Notes USD ($) | Apr. 15, 2010 4.5 % Senior Notes | Dec. 31, 2011 4.2% Senior Notes USD ($) | Dec. 31, 2012 4.2% Senior Notes | Dec. 09, 2011 4.2% Senior Notes USD ($) | Dec. 31, 2012 Other Borrowings USD ($) | Dec. 31, 2012 Other Borrowings Minimum | Dec. 31, 2012 Other Borrowings Maximum | Dec. 31, 2012 Letters Of Credit USD ($) | Dec. 31, 2012 Swing line Loans USD ($) | Dec. 31, 2012 Revolving Credit Facility USD ($) | Dec. 31, 2011 Revolving Credit Facility USD ($) | Dec. 31, 2012 Revolving Credit Facility Minimum | Dec. 31, 2012 Revolving Credit Facility Maximum
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Replaced credit facility due to expire | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving facility principal amount | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 | 25,000,000 |  |  |  |
Revolving facility expiration date | Jun. 27, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving facility closing date | Jun. 27, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate commitments of designated borrowers under the Credit Facility | 950,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.05% |  | 0.875% | 1.70%
Annual credit facility fee basis point rate spread over LIBOR | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,500,000 |  |  |
Current borrowings under revolving facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 | 50,798,000 |  |
Revolving Facility, amount available to borrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 672,500,000 |  |  |
Principal amount of private placement |  | 96,800,000 | 81,000,000 |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 2.58% |  |  | 4.50% | 4.50% |  |  | 4.20% |  | 0.40% | 3.70% |  |  |  |  |  |
Debt instrument maturity period |  | Jun. 09, 2015 | Jun. 09, 2015 |  |  |  | Dec. 15, 2020 |  |  | Dec. 15, 2021 |  |  |  |  |  |  |  |  |  |  |
Debt instrument maximum amount outstanding |  |  |  |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment, minimum percentage outstanding |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from debt offering |  |  |  |  |  |  |  | 295,700,000 |  |  |  | 346,200,000 |  |  |  |  |  |  |  |  |
Debt offering initial discount |  |  |  |  |  |  |  | 1,600,000 |  |  |  | 900,000 |  |  |  |  |  |  |  |  |
Debt offering underwriting commission |  |  |  |  |  |  | 1,900,000 |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Estimated offering expenses |  |  |  |  |  |  | 800,000 |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Contingent percentage of principal amount plus accrued and unpaid interest |  |  |  |  |  |  | 101.00% |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |
Outstanding repayment of indebtedness |  |  |  |  |  |  | 250,000,000 |  |  | 306,000,000 |  |  |  |  |  |  |  |  |  |  |
Other borrowings |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,600,000 |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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