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Derivative Instruments - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  |
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Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 29, 2011 | Dec. 31, 2010 Interest Rate Exchange Agreement Expiring 2010 Y | Apr. 30, 2010 Interest Rate Exchange Agreement Expiring 2010 | Apr. 15, 2010 Interest Rate Exchange Agreement Expiring 2010 | Oct. 31, 2011 Interest Rate Exchange Agreement Expiring 2011 | Jul. 31, 2011 Interest Rate Exchange Agreement Expiring 2011 | Jul. 12, 2011 Interest Rate Exchange Agreement Expiring 2011 | Dec. 31, 2011 Interest Rate Exchange Agreements Expiring 2011 And 2012 | Dec. 06, 2010 4.5 % Senior Notes | Apr. 15, 2010 4.5 % Senior Notes
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate contract with notional amount |  |  |  |  |  | $ 350,000,000 |  |  | $ 300,000,000 |  |  | $ 350,000,000 |  |  |
Interest rate exchange agreement expiration date |  | Feb. 28, 2012 |  |  |  |  |  | Dec. 31, 2010 |  |  | Sep. 30, 2011 |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% | 4.50%
Interest rate contract settlement amount |  |  |  |  |  |  | 31,000,000 |  |  | 34,700,000 |  |  |  |  |
Future amortization interest expense over 10 year periods |  |  | 1,685,000 | 1,263,000 | 547,000 |  | 31,000,000 |  |  |  |  |  | 37,900,000 |  |
Term of amortized interest expense, years |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.80% |  |  |  |  |  | 5.30% |  |
Additional interest rate contract settlement | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount interest rate contract |  |  |  |  |  |  |  |  |  |  |  |  | 38,700,000 |  |
Interest rate settlement recognized as other expense |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  |  | $ 7,400,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Interest Rate Contract Settlement Amount + References No definition available. + Details
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- Definition Interest Rate Contract Settlement Date + References No definition available. + Details
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- Definition Settlement amount interest rate contract + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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