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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2018
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2018
Amount of Commitment Expiration by Period - 2019 0.2
Amount of Commitment Expiration by Period - 2020 0.2
Amount of Commitment Expiration by Period - 2021 0.2
Amount of Commitment Expiration by Period - 2022 0.2
Amount of Commitment Expiration by Period - Thereafter 18.6
Total Amounts Committed 19.4
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 17.8
Total Amounts Committed 17.8
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2019 0.2
Amount of Commitment Expiration by Period - 2020 0.2
Amount of Commitment Expiration by Period - 2021 0.2
Amount of Commitment Expiration by Period - 2022 0.2
Amount of Commitment Expiration by Period - Thereafter 0.8
Total Amounts Committed $ 1.6