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Carrying Amounts of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Beginning Balance $ 146,444 $ 0
Goodwill acquired 1,784 146,444
Acquisition adjustment - Walker 2,054  
Effects of foreign currency (315)  
Ending Balance $ 149,967 $ 146,444