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Long-term Debt - Schedule of Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Notes payable maturity date 2025-03  
Minimum [Member]    
Debt Instrument [Line Items]    
Notes payable Interest rate 4.00%  
Maximum [Member]    
Debt Instrument [Line Items]    
Notes payable Interest rate 6.00%  
Term Loan Agreement [Member]    
Debt Instrument [Line Items]    
Unamortized debt issuance costs $ 4,642 $ 4,834
Vehicle and Equipment [Member]    
Debt Instrument [Line Items]    
Notes payable maturity date 2024-03  
Vehicle and Equipment [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Notes payable Interest rate 2.50%  
Vehicle and Equipment [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Notes payable Interest rate 4.80%