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Revolving Credit Facility - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Line of Credit Facility [Line Items]            
Interest expense for revolving credit facility   $ 2,907 $ 4,552 $ 10,128 $ 13,527  
Long-term Line of Credit   9,750   9,750  
Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Additional borrowings from revolving credit facility $ 8,000     1,750    
Interest expense for revolving credit facility   132   328    
Amortization of Debt Issuance Costs   39   118    
Long-term Line of Credit   $ 9,750   $ 9,750    
Debt issuance costs capitalized in other assets $ 459