Commitments and Contingencies - Additional Information (Detail) - Liquidation Value [Member] - USD ($) $ in Millions	Oct. 18, 2017	Mar. 31, 2018
Eastdil/Wells Fargo Arbitration [Member] | Corporate Joint Venture [Member]
Loss Contingencies [Line Items]
Percentage of interest sold in joint venture	48.70%
Compensation on transaction	$ 2.1
Loss contingency, originally expected compensation	4.4
Loss contingency for damages additionally sought by plaintiff	$ 2.3
Liability for Estimated Costs In Excess of Estimated Receipts [Member]
Loss Contingencies [Line Items]
Future minimum base rent payments related to ground lease accrued		$ 1.2