Organization and Formation of the Company - Additional Information (Detail)
|12 Months Ended|
Dec. 31, 2018
|Organization, Consolidation and Presentation of Financial Statements [Abstract]|
|Number of reportable segments||3|
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
No definition available.