Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Notes Payable - Summary of Long-Term Debt (Detail)

v3.8.0.1
Long-Term Debt and Notes Payable - Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument    
Capital lease obligations $ 8,960 $ 10,850
Long-term debt and capital lease obligations 271,767 148,120
Less current maturities 2,689 2,636
Long-term debt and capital lease obligations excluding current maturities $ 269,078 $ 145,484
Line of Credit | Revolving Credit Facility | LIBOR    
Debt Instrument    
Effective interest rate   3.30%
Line of Credit | Revolving Credit Facility | LIBOR | Minimum    
Debt Instrument    
Interest rate on revolving credit at LIBOR rate 1.375%  
Line of Credit | Revolving Credit Facility | LIBOR | Maximum    
Debt Instrument    
Interest rate on revolving credit at LIBOR rate 2.25%  
Line of Credit | Revolving Credit Facility | Fourth Amended and Restated Credit Agreement    
Debt Instrument    
Long-term debt $ 262,000 $ 136,000
Line of Credit | Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | LIBOR | Minimum    
Debt Instrument    
Interest rate on revolving credit at LIBOR rate 1.375%  
Line of Credit | Revolving Credit Facility | Fourth Amended and Restated Credit Agreement | LIBOR | Maximum    
Debt Instrument    
Interest rate on revolving credit at LIBOR rate 2.25%  
Other Bank Debt    
Debt Instrument    
Long-term debt $ 807 $ 1,270