Quarterly report pursuant to Section 13 or 15(d)

Summary of Interest Rate Swap Agreements Designated as Hedge Agreements (Detail)

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Summary of Interest Rate Swap Agreements Designated as Hedge Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Agreement One
Sep. 30, 2014
Agreement Two
Sep. 30, 2014
Agreement Three
Interest Rate Swaps [Line Items]          
Nominal Amount $ 450,000   $ 175,000 $ 175,000 $ 100,000
Effective Date     Dec. 01, 2010 Dec. 01, 2010 Nov. 01, 2011
Pay Rate     1.3975% 1.40% 1.715%
Receive Rate     1-Month LIBOR 1-Month LIBOR 1-Month LIBOR
Expiration Date     Sep. 01, 2015 Sep. 01, 2015 Apr. 01, 2016
Current Liability 5,318 [1] 5,367 1,929 [1] 1,953 [1] 1,436 [1]
Long-Term Liability 520 [2] 3,809     520 [2]
Estimated Total Fair Value at September 30, 2014 $ 5,838   $ 1,929 $ 1,953 $ 1,956
[1] Included in accounts payable and accrued expenses on the condensed consolidated balance sheet as of September 30, 2014.
[2] Included in other long-term liabilities on the condensed consolidated balance sheet as of September 30, 2014.