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Reconciliation 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]
Restricted Cash and Cash Equivalents Items [Line Items]          
Cash and cash equivalents $ 274,483 $ 180,519 $ 194,211 $ 161,720  
Restricted cash included in restricted assets-current 44,393 19,328 19,322 15,299  
Restricted cash included in other assets 2,301 2,309 2,359 2,565  
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.