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Fair Value Measurements - Additional Information (Detail)
Jun. 30, 2016
USD ($)
Contract
Jun. 30, 2016
GBP (£)
Contract
Dec. 31, 2015
Contract
Forward Contract to Sell [Member]      
Derivative [Line Items]      
Number of forward contract outstanding     0
Forward contract outstanding | £   £ 2,500,000  
Forward Contract to Purchase [Member]      
Derivative [Line Items]      
Number of forward contract outstanding 1 1  
Forward contract outstanding | $ $ 3,400,000