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Long Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets $ 500,737 $ 104,760
United States    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets 465,453 77,039
Europe    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets 34,430 $ 27,721
Asia    
Segment Reporting, Asset Reconciling Item [Line Items]    
Long Lived Assets $ 854