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Financial Instruments - Additional Information (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Financial Instrument [Line Items]    
Estimated fair value of contingent liability $ 0  
Standby Letters of Credit    
Financial Instrument [Line Items]    
Fair value of contingent liability 2,690,000 $ 2,662,000
Performance Bonds    
Financial Instrument [Line Items]    
Fair value of contingent liability $ 4,000,000 $ 2,300,000