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Credit Agreement - Schedule of U.S. Credit Agreement (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Credit Agreements: |  |  |  |
Credit facility borrowings | $ 80,000 |  |  |
U.S. Credit Agreement [Member] |  |  |  |
Credit Agreements: |  |  |  |
Credit facility remaining availability |  |  | 178,310 | [1]
Credit facility borrowings | 80,000 | [2] |  |
Outstanding letters of credit | 6,981 | [2],[3] | 6,690 | [1],[3]
Availability for additional letters of credit |  |  | 43,310 | [1]
Average daily revolving credit borrowings for the year ended | $ 219 | [2] |  |
Weighted average annual interest rate | 5.25% | [2] | 0.00% | [1]
Commitment fee rate | 0.25% | [2] | 0.10% | [1]
Letter of credit fee rate | 0.50% | [2],[3] | 0.50% | [1],[3]
[1] | Details reflect terms under our previous U.S. Credit Agreement which expired October 31, 2012.
[2] | Details reflect terms under our existing Credit Agreement which was entered into during December 2012, except for our outstanding letters of credit.
[3] | Represents letters of credit which are fully collateralized with $7.4 million of restricted cash.

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- Details
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- Definition Line of credit facility availability for additional letters of credit. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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