Variable Interest Entities (VIEs) - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Maximum exposure to loss VIEs limits	$ 76.6
Variable interest entity, description	As of December 31, 2016 and 2015, the Company had 10 and 12 subsidiaries, respectively, which are classified as VIEs due to the following factors and circumstances as of December 31, 2016:  Three of these subsidiaries are single property entities, designed to own and lease their respective properties to multiple tenants, which are subject to either a ground lease or an air rights lease that include buy-out and put options held by either the tenant or landlord under the applicable lease.  Four of these subsidiaries are entities with real estate under development or completed developments in which there is either insufficient equity at risk due to the development nature of each entity.  Two of these subsidiaries are joint ventures with recently completed real estate under development in which there is insufficient equity at risk due to the development nature of each joint venture.  One of these subsidiaries is a joint venture with equity interest that consists of non-substantive protective voting rights, but not any participating or kick-out rights.
Variable interest entity, similar entity aggregation, description	Two reconsideration events occurred during the year ended December 31, 2016 that resulted in the associated entities no longer being considered VIEs as of December 31, 2016.