Summary of Significant Accounting Policies - Narratives (Details)	2 Months Ended	12 Months Ended
	Aug. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) vie segment	Dec. 31, 2015 USD ($) vie	Dec. 31, 2014 USD ($)	Aug. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2013 USD ($)
Basis of Consolidation
Variable interest entities, count | vie		32
Variable interest entities consolidated, count | vie		25
Variable interest entities unconsolidated, count | vie		7	7
Variable interest entity, maximum exposure to loss		$ 152,900,000	$ 154,800,000
Assets		8,453,954,000	8,742,089,000
Cash and cash equivalents		155,482,000	157,227,000	$ 198,683,000			$ 117,519,000
Other assets		304,774,000	360,898,000
Effects of early adoption of accounting principle		13,403,000
Real estate tax expense		56,000,000	57,700,000	59,800,000
Foreign currency transaction (losses)		(3,700,000)	(800,000)	(400,000)
Windfall tax benefits - share incentive plan		$ 6,711,000	$ 12,522,000	$ 5,641,000
Internal-use software development costs | Minimum
Basis of Consolidation
Property, plant and equipment, useful life		3 years
Internal-use software development costs | Maximum
Basis of Consolidation
Property, plant and equipment, useful life		7 years
Building and building improvements | Maximum
Basis of Consolidation
Property, plant and equipment, useful life		40 years
Furniture and fixtures | Maximum
Basis of Consolidation
Property, plant and equipment, useful life		7 years
Accounts payable, accrued expenses and other liabilities
Basis of Consolidation
Prior period adjustment		$ 3,000,000
Accumulated Other Comprehensive Income (Loss)
Basis of Consolidation
Prior period adjustment		3,000,000
Income Tax Expense
Basis of Consolidation
Prior period adjustment		$ 3,000,000
Real Estate Ownership
Basis of Consolidation
Variable interest entities unconsolidated, count | vie		1	1
Managed Programs
Basis of Consolidation
Variable interest entities unconsolidated, count | vie		6	6
CESH I
Basis of Consolidation
Initial aggregate offering amount						$ 100,000,000
Proceeds from issuance of common limited partners units	$ 14,200,000
Assets					$ 30,300,000
Cash and cash equivalents					15,400,000
Other assets					$ 14,900,000
Deconsolidation gain amount		$ 1,900,000
CESH I | Maximum
Basis of Consolidation
Initial aggregate offering amount						$ 150,000,000
CPA: 16 - Global
Basis of Consolidation
Variable interest entities, count | vie		19
ASU 2015-02
Basis of Consolidation
Variable interest entities, count | vie		13
ASU 2015-02 | CPA: 16 - Global
Basis of Consolidation
Variable interest entities, count | vie			7
ASU 2015-03 | Other assets
Basis of Consolidation
Effects of early adoption of accounting principle			$ (12,600,000)
Real Estate Ownership
Basis of Consolidation
Number of reportable segments | segment		1
Assets		$ 8,242,263,000	$ 8,537,544,000