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Basis of Presentation - Schedule of Adjustment in Balance Sheet Line Items (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Investments [Line Items]    
Short-term investments $ 430,663 $ 286,795
As Previously Reported [Member]    
Schedule of Investments [Line Items]    
Short-term investments   129,594
Long-term investments   157,201
Adjustment [Member]    
Schedule of Investments [Line Items]    
Short-term investments   157,201
Long-term investments   $ (157,201)