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Carrying Amounts of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Balance $ 149,603 $ 149,967
Goodwill disposed   (500)
Effects of foreign currency 115 136
Balance $ 149,718 $ 149,603