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Borrowings - Additional Information (Detail)
12 Months Ended
Nov. 21, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 23, 2015
USD ($)
Oct. 24, 2014
USD ($)
Credit Facilities [Line Items]          
Current portion of long-term borrowings   $ 10,318,000 $ 10,000,000    
Long term borrowings   50,391,000 35,000,000    
Structured payable   709,000      
Notes Payable, Other Payables          
Credit Facilities [Line Items]          
Current portion of long-term borrowings   318,000      
Long term borrowings   391,000      
Revolving Credit Facility          
Credit Facilities [Line Items]          
Revolving credit facility   60,000,000      
Current portion of long-term borrowings   10,000,000      
Long term borrowings   50,000,000      
Unamortized debt issuance costs   $ 773,000 $ 272,000    
Revolving Credit Facility | Credit Facility          
Credit Facilities [Line Items]          
Revolving credit facility         $ 50,000,000
Option to increase additional credit facility       $ 50,000,000  
Line of credit interest rate during period   2.99%      
Revolving Credit Facility | New Credit Agreement          
Credit Facilities [Line Items]          
Revolving credit facility $ 200,000,000        
Option to increase additional credit facility $ 100,000,000        
Line of credit interest rate during period   3.50%      
Interest coverage ratio, minimum 3.5        
Debt Instrument, Covenant, Leverage Ratio, Maximum 3.0        
Issuance costs $ 790,000        
Revolving Credit Facility | New Credit Agreement | Minimum          
Credit Facilities [Line Items]          
Commitment fee percentage range on unused credit facility 0.15%        
Revolving Credit Facility | New Credit Agreement | Maximum          
Credit Facilities [Line Items]          
Commitment fee percentage range on unused credit facility 0.30%        
Revolving Credit Facility | New Credit Agreement | Prime Rate | Minimum          
Credit Facilities [Line Items]          
Basis spread on variable rate 0.00%        
Revolving Credit Facility | New Credit Agreement | Prime Rate | Maximum          
Credit Facilities [Line Items]          
Basis spread on variable rate 0.75%        
Revolving Credit Facility | New Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum          
Credit Facilities [Line Items]          
Basis spread on variable rate 1.00%        
Revolving Credit Facility | New Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum          
Credit Facilities [Line Items]          
Basis spread on variable rate 1.75%