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Financial Instruments - Summary of Outstanding Interest Rate Swaps (Detail) - Interest Rate Swap [Member] - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Other Non-current Liability [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 45,000,000  
Fair Value (591,000)  
Other Non-current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value   $ 1,096,000
Notional Amount   $ 70,000,000
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value 66,000  
Notional Amount $ 25,000,000