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Derivative Instruments (Additional Information) (Detail) $ in Thousands | 6 Months Ended | 24 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2011 USD ($) instrument
Derivative [Line Items] |  |  |
Amortization of interest expense | $ 860 | $ 859 |
Amount to be recognized from hedged transactions within 12 months, approximate | $ 6,900 |  |
Interest Rate Exchange Agreement Expiring 2010 and 2011 |  |  |
Derivative [Line Items] |  |  |
Amortization of interest expense |  |  | $ 68,900
Term of amortized interest expense, years |  |  | 10 years
4.5% Senior Notes, due December 2020 |  |  |
Derivative [Line Items] |  |  |
Interest rate on senior notes |  |  | 4.50%
4.2% Senior Notes, due December 2021 |  |  |
Derivative [Line Items] |  |  |
Interest rate on senior notes |  |  | 4.20%
Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Number of instruments held | instrument |  |  | 2

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