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Fair Value - Information About Our Fixed Rate Financial Instruments Not Measured at Fair Value (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Debt $ 429,295 $ 357,407
Senior Notes [Member]
   
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Debt $ 250,000 $ 0
Interest Rate Percentage 8.50%  
Debt instrument, maturity year May 12, 2014