Revenue from Contracts with Customers - Information about Receivables with Customers (Detail) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Dec. 31, 2018 |
---|---|---|
Other Assets [Member] | ||
Disaggregation of Revenue [Line Items] | ||
Receivables, which are included in "Other assets" | $ 1,142 | $ 1,205 |