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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Private Placement Warrants [Member]
Black-Scholes [Member]
Dec. 31, 2013
Private Placement Warrants [Member]
Black-Scholes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Warrant sensitivity percentage           10.00%
Estimated fair value         $ 1,700,000  
Private placement warrant (income) expense (99,000) 4,207,000 (332,000) 9,053,000    
Contingent liability description     A five percentage point decrease in the volatility factor would result in an increase in the fair value of the contingent consideration by approximately $50,000.      
Change in contingent liability     50,000      
Change in the fair value of contingent consideration $ (900,000)