Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Carrying Value $ 1,024,703 $ 882,678
7.0% Senior Subordinated Notes Expired [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value   211,000
Long-term Debt, Carrying Value   198,871
5.0% Senior Subordinated Notes due 2023 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 279,148 284,934
Long-term Debt, Carrying Value 289,273 289,273
6.125% Senior Subordinated Notes due 2027 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 248,750  
Long-term Debt, Carrying Value 250,000  
Mortgage Loan at Fix Interest Rate [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 203,031 185,979
Long-term Debt, Carrying Value 199,972 176,369
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 3,760 4,057
Long-term Debt, Carrying Value $ 3,947 $ 4,280