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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Derivative [Line Items] |  |
U.S. Treasury Note, maturity term (in years) | 10 years |
Proceeds from or (payments to) settlement of interest rate protection agreement |  | $ 65,500,000
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax | (5,700,000) |
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax | (3,700,000) |
2008 Interest Rate Protection Agreement |  |
Derivative [Line Items] |  |
Proceeds from or (payments to) settlement of interest rate protection agreement | (4,400,000) |
2010 Interest Rate Protection Agreement |  |
Derivative [Line Items] |  |
Proceeds from or (payments to) settlement of interest rate protection agreement | 9,900,000 |
2011 Interest Rate Protection Agreement |  |
Derivative [Line Items] |  |
Proceeds from or (payments to) settlement of interest rate protection agreement | $ (65,500,000) |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months, net of tax. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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- Definition The net cash outflow or inflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3581-108585 + Details
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