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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures    
Amount of interest rate risk expected to be reclassified in the next 12 months $ 400,000  
Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures    
Notional amount $ 200,000,000.0  
Derivative instrument, underlying rate (percentage) 1.85%  
Derivative instrument, effective rate (percentage) 3.05%  
LIBOR | Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures    
Derivative instrument, variable rate (percentage) 1.20%  
Term Loan    
Derivative Instruments and Hedging Activities Disclosures    
Debt instrument face amount $ 200,000,000.0  
Loans Payable    
Derivative Instruments and Hedging Activities Disclosures    
Derivative, contract term (years)   3 years
Loans Payable | LIBOR | Minimum    
Derivative Instruments and Hedging Activities Disclosures    
Debt instrument, variable rate on spread 1.20%  
Loans Payable | LIBOR | Maximum    
Derivative Instruments and Hedging Activities Disclosures    
Debt instrument, variable rate on spread 1.90%