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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	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	$ 773,412us-gaap_LongTermDebt
7.0% Senior Subordinated Notes Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	216,000	218,000
Long-term Debt, Carrying Value	198,556	198,414
5.0% Senior Subordinated Notes due 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	294,000	285,000
Long-term Debt, Carrying Value	300,000	300,000
Mortgage Loan at Fix Interest Rate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	152,240	165,381
Long-term Debt, Carrying Value	147,554	157,571
Assumed Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	4,365	7,636
Long-term Debt, Carrying Value	4,474	7,993
Other [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	4,588	4,774
Long-term Debt, Carrying Value	$ 4,884	$ 5,080

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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