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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financial Instruments [Line Items]      
Estimated fair value of long-term debt $ 2,140,000 $ 2,180,000 $ 2,190,000
Long-term debt $ 2,100,000 $ 2,100,000 $ 2,100,000