XML 82 R69.htm IDEA: XBRL DOCUMENT v3.10.0.1
Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Revolving line of credit & Secured long-term debt $ 330,784 $ 292,074
Less current portion (101,713) (77,266)
Total long-term debt 229,071 214,808
Revolving Line of Credit [Member]    
Debt Instrument [Line Items]    
Revolving line of credit   45,000
Secured Equipment Notes due in 2024 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 11,658 13,586
Secured Equipment Notes due in 2023 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 192,858 36,981
Secured Equipment Notes due in 2022 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 24,092 30,301
Secured Equipment Notes due in 2021 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 55,855 76,885
Secured Equipment Notes due in 2020 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 32,904 50,737
Secured Equipment Notes due in 2019 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt $ 13,417 36,178
Secured Equipment Notes due in 2018 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt   $ 2,406