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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]      
Unrealized (gain) loss on indemnification assets $ (14,000) $ 446,000 $ 383,000
Termination dates of contracts end Sep. 30, 2015    
Merger transaction completed date Sep. 30, 2010    
Transfer in or out of Level 3 assets $ 0 $ 0 $ 0