The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	Apr. 04, 2018 USD ($)	Sep. 30, 2018 USD ($) lawsuit	Sep. 14, 2018 USD ($)	Apr. 30, 2016 USD ($)	Sep. 30, 2011 lawsuit
Loss Contingencies [Line Items]
Number of lawsuits against Company \| lawsuit		7			55
Escrow Deposit			$ 0.0
Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		$ 14.1
Expiring in 2018 \| Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		0.6
Expiring in 2019 \| Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		0.4
Expiring in 2020 \| Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		0.1
Expiring in 2021 \| Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		2.4
Expiring in 2022 \| Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		3.1
Expiring in 2023 \| Surety Bond
Loss Contingencies [Line Items]
Bonds outstanding		7.5
Line of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding amount		$ 3.1
Phazzer
Loss Contingencies [Line Items]
Litigation settlement, amount awarded from other party	$ 7.8
Paris, France \| International Chamber of Commerce
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss				$ 0.6