Assets Held for Sale, Net and Discontinued Operations - Additional Information (Detail)	1 Months Ended		3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended			24 Months Ended
	Nov. 30, 2016 Property	Oct. 31, 2016 USD ($) Property	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Property	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2016 USD ($) Property	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property	Dec. 31, 2016 Property	Apr. 01, 2016 Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property							6							6
Net proceeds from sale of real estate investments													$ 148,319,000	$ 992,738,000	$ 384,293,000
Sale of properties, outstanding principal indebtedness assumed													39,206,000	529,893,000	365,224,000
Net income (Loss) from continuing operations			$ 1,530,000	$ 20,701,000	$ 43,063,000	$ 654,000	$ (121,173,000)	$ 32,121,000	$ 227,160,000	$ (8,215,000)	$ 218,945,000	$ 251,066,000	65,948,000	129,893,000	(92,144,000)
Impairment provisions													8,142,000	$ 124,873,000	30,428,000
Intrawest Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership interest acquired																	20.00%
Percentage of ownership by parent																	100.00%
Ski and Mountain Lifestyle Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property																	7
Number of properties sold | Property														1
Ski and Mountain Lifestyle Properties | Intrawest Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties acquired | Property																	7
Ski and Mountain Lifestyle Properties | Continuing Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain or loss on sale of properties													$ 100,000	$ 46,600,000
Unimproved Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment provisions														1,800,000	30,400,000
Senior Housing Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition fee														0
Sale of properties, outstanding principal indebtedness assumed														$ 151,500,000
Disposal Group, Disposed of by Sale, Including Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property														55
Gain or loss on sale of properties														$ 246,800,000
Disposal Group, Disposed of by Sale, Including Discontinued Operations | Senior Housing Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of real estate investments														$ 992,700,000
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of real estate investments															384,300,000
Gain or loss on sale of properties															4,100,000
Impairment provisions															$ 4,500,000
Discontinued Operations, Disposed of by Sale | Marinas Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property													5	12
Gain or loss on sale of properties														$ 200,200,000
Discontinued Operations, Disposed of by Sale | Golf Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property															48
Discontinued Operations, Disposed of by Sale | Senior Housing Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property														38
Discontinued Operations, Disposed of by Sale | Multi Family Residential
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property															1
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property	36
Net gain from sale of real estate													$ 10,600,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Attractions properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property														4
Gain or loss on sale of properties														$ 46,600,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Continuing Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain from sale of real estate													900,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain from sale of real estate													$ 9,700,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Marinas Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property													5
Net proceeds from sale of real estate investments													$ 50,400,000
Disposition fee													$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Unimproved land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property													1
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ski and Mountain Lifestyle Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property		7												1
Net proceeds from sale of real estate investments		$ 97,900,000
Net gain from sale of real estate		(800,000)
Disposition fee		$ 0
Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale | Property							6							6
Assets Held-for-sale | Ski and Mountain Lifestyle Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (Loss) from continuing operations														$ 19,800,000	$ (1,200,000)
Assets Held-for-sale | Ski and Mountain Lifestyle Properties | Operating Income (Loss)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain or loss on sale of properties														13,500,000
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain from sale of real estate													$ 9,687,000	200,243,000	4,144,000
Impairment provisions related to real state properties													$ 0	7,749,000	37,867,000
Discontinued Operations, Held-for-sale | Marinas Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties sold | Property																17
Impairment provisions related to real state properties														$ 7,700,000	$ 33,400,000