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v3.19.1

Commitments and Contingencies Commitments and Contingencies - Additional Information (Detail) (Details) $ in Millions | 6 Months Ended
--- | ---
Feb. 17, 2019 USD ($)
Loss Contingencies [Line Items] |
Litigation Settlement, Amount Awarded to Other Party | $ 5

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration