Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Depreciation Expense on Property and Equipment,Including Leased Assets (Detail)

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Property and Equipment, Net - Depreciation Expense on Property and Equipment,Including Leased Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 15,804 $ 15,596 $ 15,937