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Long-Term Debt - Additional Information (Details)
6 Months Ended
Dec. 08, 2017
USD ($)
quarter
Oct. 31, 2014
quarter
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Notes Payable and Other        
Debt outstanding     $ 152,249,000 $ 166,878,000
Senior credit facility        
Senior Credit Facility        
Maximum borrowing capacity     250,000,000  
Line of credit facility, higher borrowing capacity option     300,000,000  
Maximum borrowing capacity in non-U.S. Dollar currencies     30,000,000.0  
Maximum amount available for the issuance of letters of credit     10,000,000.0  
Outstanding borrowings     142,600,000  
Outstanding letters of credit     5,400,000  
Amount of non-recurring charges used as threshold used for calculation of funded debt leverage ratio $ 5,000,000.0      
Number of consecutive fiscal quarters used for calculating funded debt leverage ratio | quarter 4 4    
Funded debt leverage ratio at which the entity will have the benefit of lowest interest margin (less than or equal to)   0.5    
Funded debt leverage ratio at which the entity will bear the maximum interest rate margin (greater than)   2.75    
Additional interest rate margin if funded debt leverage ratio exceeds threshold (as a percent)   2.00%    
Funded debt leverage ratio for additional interest payment (less than)   3.5    
Interest coverage ratio (greater than)   3.0    
Preceding period used for calculating Interest Coverage Ratio 12 months 12 months    
Number of fiscal quarters to temporary increase funded debt leverage ratio | quarter 4      
Notes Payable and Other        
Debt outstanding     $ 142,595,000 156,948,000
Senior credit facility | Maximum        
Senior Credit Facility        
Temporary increase in funded debt leverage ratio 3.75      
Senior credit facility | LIBOR        
Senior Credit Facility        
Reference rate, description   LIBOR    
Senior credit facility | LIBOR | Minimum        
Senior Credit Facility        
Margin (as a percent)   1.00%    
Senior credit facility | LIBOR | Maximum        
Senior Credit Facility        
Margin (as a percent)   2.00%    
Senior credit facility | Base rate        
Senior Credit Facility        
Reference rate, description   base rate    
Senior credit facility | Base rate | Minimum        
Senior Credit Facility        
Margin (as a percent)   (0.375%)    
Senior credit facility | Base rate | Maximum        
Senior Credit Facility        
Margin (as a percent)   (1.25%)    
Notes payable        
Notes Payable and Other        
Interest rate (as a percent)     3.45%  
Debt outstanding     $ 142,000 228,000
Notes payable | Minimum        
Notes Payable and Other        
Maturity term from the date of acquisition     3 years  
Other        
Notes Payable and Other        
Debt outstanding     $ 9,512,000 $ 9,702,000
Other | Minimum        
Notes Payable and Other        
Interest rate (as a percent)     0.50%  
Debt monthly periodic payments     $ 1,000  
Other | Maximum        
Notes Payable and Other        
Interest rate (as a percent)     6.20%  
Debt monthly periodic payments     $ 18,000