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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2014
Fair Value, Inputs, Level 3
Dec. 31, 2013
Fair Value, Inputs, Level 3
Loss Contingencies [Line Items]          
Accrual for the probable payment of pending claims     $ 20,020    
Loss from discontinued operations, net of tax (3,777) (3,777)      
Fair value of contingent purchase price commitments       $ 19,265 $ 18,249