Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Fair Value Measurements - Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Carrying Value $ 1,075,865 $ 882,678
7.0% Senior Subordinated Notes Due 2022 [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 282,764 284,934
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 256,875  
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 200,614 185,979
Long-term Debt, Carrying Value 197,053 176,369
Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt, Fair Value 3,836 4,057
Long-term Debt, Carrying Value $ 4,031 $ 4,280