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Purchase Price of Acquisition (Parenthetical) (Detail)
£ in Millions, $ in Millions
Jun. 30, 2015
USD ($)
Jun. 30, 2015
GBP (£)
Jan. 15, 2014
USD ($)
Jan. 15, 2014
GBP (£)
Thomas Plant        
Business Acquisition [Line Items]        
Undiscounted deferred and contingent consideration, higher range $ 9.0 £ 5.5 $ 9.0 £ 5.5