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Financial Instruments - Summary of Outstanding Interest Rate Swaps (Detail) - Interest Rate Swap [Member] - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Other Non-current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 70,000,000 $ 50,000,000
Fair Value 629,000 525,000
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Notional Amount 10,000,000 10,000,000
Fair Value $ 13,000 $ 4,000