XML 62 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Financial Reporting By Business Segments - Additional Information (Detail) | 6 Months Ended
--- | ---
Jun. 30, 2018 Segment
Segment Reporting [Abstract] |
Number of business segments | 3

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration