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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financial Assets    
Non-qualified retirement savings plan assets $ 6,220 $ 6,000
Derivatives 27 1
Total Assets 6,247 6,001
Financial Liabilities    
Contingent consideration (2,689) (4,425)
Derivatives (27) (1)
Total Liabilities (2,716) (4,426)
Level 1 [Member]
    
Financial Assets    
Non-qualified retirement savings plan assets 5,054 4,944
Derivatives      
Total Assets 5,054 4,944
Financial Liabilities    
Contingent consideration      
Derivatives      
Total Liabilities      
Level 2 [Member]
    
Financial Assets    
Non-qualified retirement savings plan assets 1,166 1,056
Derivatives 27 1
Total Assets 1,193 1,057
Financial Liabilities    
Contingent consideration      
Derivatives (27) (1)
Total Liabilities (27) (1)
Level 3 [Member]
    
Financial Assets    
Non-qualified retirement savings plan assets      
Derivatives      
Total Assets      
Financial Liabilities    
Contingent consideration (2,689) (4,425)
Derivatives      
Total Liabilities $ (2,689) $ (4,425)