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Details of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
 [1]
Cash and Cash Equivalents [Line Items]          
Cash and deposits in bank $ 58,391 $ 28,780      
Time deposits 199,064 151,739      
Bonds acquired under repurchase agreements 17,028        
Total cash and cash equivalents 274,483 180,519 $ 194,211 $ 161,720  
Restricted cash (Note 2) 46,694 21,637      
Total cash ,cash equivalents, and restricted cash $ 321,177 $ 202,156 [1] $ 215,892 [1] $ 179,584 [1] $ 172,509
[1] The restricted cash is only included in the amount of "as adjusted" item.