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Derivative Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2011 Interest Rate Exchange Agreement Expiring 2010 and 2011 [Member] | Dec. 06, 2010 4.5% Senior Notes, due December 2020 | Dec. 09, 2011 4.2% Senior Notes, due December 2021
Derivative [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  |  | 4.50% | 4.20%
Amortization of interest expense | $ 429,000 | $ 425,000 | $ 68,900,000 |  |
Term of amortized interest expense, years |  |  | 10 years |  |
Amount to be recognized from hedged transactions within 12 months, approximate | $ 7,200,000 |  |  |  |

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