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Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 253,821 $ 273,414
UNITED STATES    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 189,195 198,424
Foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets [1] $ 64,626 $ 74,990
[1] As of December 31, 2016 and 2015, long-lived assets attributable to Singapore were $31.5 million and $39.9 million, respectively.