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Other Assets and Intangibles - Summary of Estimated Net Future Amortization Associated with Above and Below-Market Leases (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Intangible Assets Net Excluding Goodwill [Abstract]  
Future amortization income, 2019 $ 3.6
Future amortization income, 2020 3.5
Future amortization income, 2021 3.5
Future amortization income, 2022 3.6
Future amortization income, 2023 $ 3.7