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Impairment Charges and Reserves - Summary of Significant Unobservable Inputs (Detail) - Fair Value Measurements [Member] $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / a	Dec. 31, 2017 USD ($) $ / a	Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value	$ 51.5	$ 307.1	$ 215.7
Preferred Equity Interests, Fair Value	185.5	272.0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value	51.5	307.1	$ 215.7
Preferred Equity Interests, Fair Value	185.5	272.0
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Indicative Bid [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value	351.2
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value	$ 694.1
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Minimum [Member] | Measurement Input Market Capitalization Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate	7.38%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Maximum [Member] | Measurement Input Market Capitalization Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate	9.34%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value	$ 32.0	$ 499.3
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Measurement Input Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate	9.50%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	10.50%	7.45%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Measurement Input Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate		7.75%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	21.40%	21.39%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Measurement Input Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate		9.50%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Sales Comparison Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value	$ 2.2	$ 7.4
Price per Acre, Range | $ / a	35,000
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Sales Comparison Approach [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Price per Acre, Range | $ / a		50,000
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Sales Comparison Approach [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Price per Acre, Range | $ / a		218,000
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value		$ 166.8
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Consolidated Assets, Fair Value		$ 882.6
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Minimum [Member] | Measurement Input Market Capitalization Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate		6.25%
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Maximum [Member] | Measurement Input Market Capitalization Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate		10.00%
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Equity Interests, Fair Value	$ 185.5	$ 272.0
NOI growth rate	1.00%	1.00%
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	7.90%	7.80%
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Measurement Input Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate	8.40%	8.40%
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal capitalization rate	9.10%	8.50%
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Measurement Input Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs rate	9.00%	8.80%

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