Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Detail)

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Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Carrying Value $ 752,074 $ 629,385
9.0% Senior Subordinated Notes due 2018 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value   231,525
Long-term Debt, Carrying Value   208,923
7.0% Senior Subordinated Notes due 2022 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 212,500 222,000
Long-term Debt, Carrying Value 198,380 198,282
5.0% Senior Subordinated Notes due 2023 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 273,750  
Long-term Debt, Carrying Value 300,000  
Mortgage Loan at Fix Interest Rate [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 165,986 148,244
Long-term Debt, Carrying Value 159,336 137,791
Assumed Notes [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 8,403 10,592
Long-term Debt, Carrying Value 8,805 11,289
Other [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 4,825 4,971
Long-term Debt, Carrying Value $ 5,168 $ 5,341