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Segment Information - Summary of Geographic Segment Data (Parenthetical) (Detail) - Geographic Concentration Risk [Member] - Maximum [Member]
6 Months Ended
Jun. 30, 2018
Net Assets, Geographic Area [Member]  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Concentration risk percentage 10.00%
Sales Revenue, Net [Member]  
Revenues from External Customers and Long-Lived Assets [Line Items]  
Concentration risk percentage 10.00%