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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |
Derivative credit risk valuation adjustment, derivative assets | $ 0.1 | $ 0.2

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- Definition Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
Name: | us-gaap_DerivativeCreditRiskValuationAdjustmentDerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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