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Acquisitions - Additional Information (Detail) - Thomas Plant
$ / shares in Units, £ in Millions, $ in Millions
9 Months Ended
Jan. 15, 2014
USD ($)
shares
Jan. 15, 2014
GBP (£)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2015
GBP (£)
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2015
GBP (£)
Jan. 15, 2014
GBP (£)
Business Acquisition [Line Items]              
Percentage of equity interests acquired 100.00%           100.00%
Business acquisition cash paid $ 61.5 £ 37.4          
Business acquisition, issuance of common stock shares | shares 581,432 581,432          
Business acquisition, common stock value $ 9.0 £ 5.5          
Business acquisition, contingent cash consideration payable $ 9.0           £ 5.5
Business combination related costs         $ 0.9    
Net loss         $ (6.6)    
Basic and diluted loss per common share | $ / shares         $ (0.49)    
Amended Agreement              
Business Acquisition [Line Items]              
Fair value of contingent consideration     $ 4.8     £ 3.2  
Charge recoded in selling, general and administrative expenses     $ 1.5 £ 1.0      
Cost of Sales              
Business Acquisition [Line Items]              
Business combination increase in fair value of inventory         $ 0.9