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Notes Payable and Other Noncurrent Liabilities - Notes Payable (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Notes Payable through December 2019 [Member]    
Line of Credit Facility [Line Items]    
Monthly payment of notes payable $ 556  
Number of days of bank operating rate to calculate interest on notes payable 30 days  
Interest rate of notes payable 3.11%  
Notes Payable through December 2019 [Member] | LIBOR [Member]    
Line of Credit Facility [Line Items]    
Interest rate of notes payable   1.75%
Annuities Extending through 2019 [Member]    
Line of Credit Facility [Line Items]    
Quarterly payment of notes payable $ 34  
Interest rate of notes payable 10.00% 10.00%
Revolving Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Number of days of bank operating rate to calculate interest on notes payable 30 days  
Interest rate of notes payable   2.30%
Revolving Line of Credit [Member] | LIBOR [Member]    
Line of Credit Facility [Line Items]    
Interest rate of notes payable 1.75%