During the second quarter of 2019, we identified an error in the accounting for the distribution of the Spin Companies. As a result, the error, which was determined by management to be immaterial to the previously issued Consolidated Financial Statements and to the three and six months ended June 30, 2019, has been corrected herein by increasing Accumulated Deficit by $12.0 million.

Equity - Narrative (Detail) $ in Millions	3 Months Ended	6 Months Ended
Equity - Narrative (Detail) $ in Millions	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Oct. 01, 2016 Entity
Equity [Line Items]
Number of entities resulted from spinoff of an entity \| Entity			2
Error In Accounting For Distribution of Spin Companies
Equity [Line Items]
Immaterial error correction		During the second quarter of 2019, we identified an error in the accounting for the distribution of the Spin Companies. As a result, the error, which was determined by management to be immaterial to the previously issued Consolidated Financial Statements and to the three and six months ended June 30, 2019, has been corrected herein by increasing Accumulated Deficit by $12.0 million.
Error In Accounting For Distribution of Spin Companies \| Accumulated Deficit
Equity [Line Items]
Increasing accumulated deficit \| $	$ 12.0	$ 12.0