Quarterly report pursuant to Section 13 or 15(d)

The Company and Basis of Presentation - Additional Information (Detail)

v3.10.0.1
The Company and Basis of Presentation - Additional Information (Detail)
Sep. 30, 2018
Minimum  
Organization Consolidation And Presentation Of Financial Statements [Line Items]  
Equity method investment, ownership percentage 20.00%
Maximum  
Organization Consolidation And Presentation Of Financial Statements [Line Items]  
Equity method investment, ownership percentage 50.00%
Cost method investment, ownership Percentage 20.00%