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Fair Value of Financial Instruments (Carrying Values and Fair Values of Debt Instruments) (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Carrying value of senior notes $ 1,935,293 $ 2,072,975
Senior Notes due 2015 [Member]
   
Debt Instrument [Line Items]    
Carrying value of senior notes 175,000 175,000
Fair value of senior notes 185,802 [1] 187,206 [1]
Interest rate of senior notes 6.22% 6.22%
Senior note year due 2015 2015
Senior Notes due 2016 [Member]
   
Debt Instrument [Line Items]    
Carrying value of senior notes 100,000 100,000
Fair value of senior notes 103,177 [1] 102,066 [1]
Interest rate of senior notes 3.30% 3.30%
Senior note year due 2016 2016
Senior Notes due 2018 [Member]
   
Debt Instrument [Line Items]    
Carrying value of senior notes 50,000 50,000
Fair value of senior notes 52,937 [1] 50,992 [1]
Interest rate of senior notes 4.00% 4.00%
Senior note year due 2018 2018
Senior Notes due 2019 [Member]
   
Debt Instrument [Line Items]    
Carrying value of senior notes 175,000 175,000
Fair value of senior notes 194,147 [1] 185,037 [1]
Interest rate of senior notes 5.25% 5.25%
Senior note year due 2019 2019
Senior Notes due 2021 [Member]
   
Debt Instrument [Line Items]    
Carrying value of senior notes 100,000 100,000
Fair value of senior notes $ 107,694 [1] $ 100,341 [1]
Interest rate of senior notes 4.64% 4.64%
Senior note year due 2021 2021
[1] Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.