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Acquisitions - Additional Information (Detail) - Thomas Plant
$ / shares in Units, £ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jan. 15, 2014
USD ($)
shares
Jan. 15, 2014
GBP (£)
shares
Jun. 30, 2014
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
Jun. 30, 2015
GBP (£)
Jun. 30, 2014
USD ($)
$ / shares
Jun. 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     $ 9.0     £ 5.5 £ 5.5
Business combination related costs           $ 0.9    
Net loss     $ (2.9)     $ (5.0)    
Basic and diluted loss per common share | $ / shares     $ (0.21)     $ (0.37)    
Amended Agreement                
Business Acquisition [Line Items]                
Fair value of contingent consideration       5.0     £ 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     $ 0.4     $ 0.9