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Details of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents [Line Items]        
Cash and deposits in bank $ 28,780 $ 38,851    
Time deposits 151,739 155,360    
Cash and Cash Equivalents, at Carrying Value $ 180,519 $ 194,211 $ 161,720 $ 154,734