Share-Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based compensation, allocation and classification in financial statements [Abstract]
Compensation cost charged to income for the Company's share-based compensation plans	$ 6,400,000	$ 9,200,000	$ 10,800,000
Reversal of Prior Period Share Based Compensation Expense	300,000
Compensation cost capitalized as part of properties and deferred leasing costs	$ 300,000	$ 900,000	$ 900,000
2018 Omnibus Plan [Member]
Deferred compensation arrangements [Abstract]
Aggregate number of Company common shares or Operating Partnership units approved for awards under the 2008 Omnibus Plan, original (in shares)	2,800,000
Share Based Compensation Arrangement By Share Based Payment Award Option Deduction Basis	one share or TRG Profits Unit for every one share or TRG Profits Unit granted
Profits Units [Member]
Summary of non-option activity, additional disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Description	represents a contingent right to receive a TRG Unit upon vesting and the satisfaction of certain tax-driven requirements and, as to the TSR and NOI Performance-based TRG Profits Units, the satisfaction of certain performance-based requirements. Until vested, a TRG Profits Unit entitles the holder to only one-tenth of the distributions otherwise payable by TRG on a TRG Unit. Therefore, we account for these TRG Profits Units as participating securities in TRG. A portion of the TRG Profits Units award represents estimated cash distributions that otherwise would have been payable during the vesting period and, upon vesting, there will be an adjustment in actual number of TRG Profits Units realized under each award to reflect TRG's actual cash distributions during the vesting period
TSR Performance-based TRG Profits Units [Member]
Summary of non-option activity, additional disclosures [Abstract]
Target Grant Amount	300.00%
Weighted Average Payout Rate for Vesting During Period	22.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)	148,078	129,733	103,369
Outstanding at end of period (in shares)	50,420	148,078	129,733
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)	$ 25.17	$ 25.59	$ 26.42
Granted (in shares)		18,345	103,666
Granted, weighted average grant date fair value (in dollars per share)		$ 22.22	$ 23.14
Forfeited			(77,302)
Forfeited, weighted average grant date fair value (in dollars per share)			$ 23.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(21,169)	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 26.30
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Recovered and Cancelled	(76,489)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Recovered and Cancelled, Weighted Average Grant Date Fair Value	$ 26.42
Outstanding at end of period, weighted average grant date fair value (in dollars per share)	$ 22.81	$ 25.17	$ 25.59
Summary of option activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number Of Forfeitures	0
NOI Performance-based TRG Profits Units [Member]
Summary of non-option activity, additional disclosures [Abstract]
Target Grant Amount	300.00%
Weighted Average Payout Rate for Vesting During Period	30.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 100,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 2 months 12 days
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)	149,949	131,604	103,369
Outstanding at end of period (in shares)	50,420	149,949	131,604
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)	$ 19.29	$ 19.69	$ 41.87
Granted (in shares)		18,345	103,666
Granted, weighted average grant date fair value (in dollars per share)		$ 16.43	$ 19.35
Forfeited			(75,431)
Forfeited, weighted average grant date fair value (in dollars per share)			$ 20.59
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(30,799)	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 18.86
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Recovered and Cancelled	(68,730)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Recovered and Cancelled, Weighted Average Grant Date Fair Value	$ 17.47
Outstanding at end of period, weighted average grant date fair value (in dollars per share)	$ 2.99	$ 19.29	$ 19.69
Summary of option activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number Of Forfeitures	0
Performance Shares [Member]
Summary of non-option activity, additional disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Description	represents the right to receive, upon vesting, shares of common stock ranging from 0-300% of the TSR PSU based on our market performance relative to that of a peer group. The TSR PSU grants include a cash payment upon vesting equal to the aggregate cash dividends that would have been paid on such shares of common stock during the vesting period.
Weighted Average Payout Rate for Vesting During Period			60.00%
Payout Rate for Vesting During Period Low End of Range			0.00%
Payout Rate for Vesting During Period High End of Range			100.00%
Actual Shares Issued Upon Vesting During Period		45,941	30,601
Payout Rate for Vesting During Period		124.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		$ 2,700,000	$ 2,100,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 1,300,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)	14,197	40,850	166,027
Outstanding at end of period (in shares)	29,375	14,197	40,850
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)	$ 79.13	$ 107.38	$ 138.93
Granted (in shares)	20,936	10,393	5,046
Granted, weighted average grant date fair value (in dollars per share)	$ 85.44	$ 78.82	$ 80.16
Forfeited	(5,758)		(50,459)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 82.59		$ 90.51
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		(37,046)	(79,764)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		$ 110.09	$ 181.99
Outstanding at end of period, weighted average grant date fair value (in dollars per share)	$ 82.95	$ 79.13	$ 107.38
Summary of option activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number Of Forfeitures	0
NOI Performance Shares [Member]
Summary of non-option activity, additional disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Description	represents the right to receive, upon vesting, shares of common stock ranging from 0-300% of the NOI PSU based on our NOI performance, as well as a cash payment upon vesting equal to the aggregate cash dividends that would have been paid on such shares of common stock during the vesting period. These awards also provide for a cap on the maximum number of units vested if absolute TSR is not positive over a three-year period.
Weighted Average Payout Rate for Vesting During Period			100.00%
Actual Shares Issued Upon Vesting During Period			1,242
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested			$ 100,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 800,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 10 months 24 days
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)	14,197	3,804	0
Outstanding at end of period (in shares)	29,375	14,197	3,804
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)	$ 60.59	$ 67.00	$ 0
Granted (in shares)	20,936	10,393	5,046
Granted, weighted average grant date fair value (in dollars per share)	$ 52.41	$ 58.28	$ 67.04
Forfeited	(5,758)		(1,242)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 57.42		$ 67.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		0	0
Outstanding at end of period, weighted average grant date fair value (in dollars per share)	$ 40.95	$ 60.59	$ 67.00
Summary of option activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number Of Forfeitures	0
Restricted Stock Units (RSUs) [Member]
Summary of non-option activity, additional disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Description	represents the right to receive upon vesting one share of common stock, as well as a cash payment upon vesting equal to the aggregate cash dividends that would have been paid on such shares of common stock during the vesting period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeiture Assumption	2.70%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 3,400,000	$ 4,600,000	$ 8,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 4,200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)	184,673	195,021	231,903
Outstanding at end of period (in shares)	179,846	184,673	195,021
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)	$ 63.44	$ 69.22	$ 70.40
Granted (in shares)	87,720	69,931	102,568
Granted, weighted average grant date fair value (in dollars per share)	$ 52.41	$ 58.28	$ 63.33
Forfeited	(19,249)	(6,985)	(12,499)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 57.90	$ 63.21	$ 67.78
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(73,298)	(73,294)	(126,951)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 66.22	$ 73.91	$ 66.98
Outstanding at end of period, weighted average grant date fair value (in dollars per share)	$ 57.73	$ 63.44	$ 69.22
Fully Vested	10,133
Fully Vested (in dollars per share)	$ 58.75
Restricted TRG Profits Units [Member]
Summary of non-option activity, additional disclosures [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	10 months 24 days
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)	69,285	61,131	45,940
Outstanding at end of period (in shares)	22,411	69,285	61,131
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)	$ 57.93	$ 59.08	$ 59.49
Granted (in shares)		8,154	46,076
Granted, weighted average grant date fair value (in dollars per share)		$ 49.29	$ 57.84
Forfeited			(30,885)
Forfeited, weighted average grant date fair value (in dollars per share)			$ 57.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(46,506)	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 59.45
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Recovered and Cancelled	(368)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Recovered and Cancelled, Weighted Average Grant Date Fair Value	$ 59.49
Outstanding at end of period, weighted average grant date fair value (in dollars per share)	$ 54.73	$ 57.93	$ 59.08
Summary of option activity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number Of Forfeitures	0
Share-based Payment Arrangement, Option [Member]
Summary of option activity, additional disclosures [Abstract]
Total intrinsic value of options exercised during the period		$ 3,500,000
Cash received from options exercised during the period		$ 9,800,000
Summary of option activity [Roll Forward]
Outstanding options at beginning of period (in shares)		0	202,586
Exercised, Number of Options			(202,586)
Outstanding options at end of period (in shares)			0
Outstanding at beginning of period, weighted average exercise price (in dollars per share)			$ 48.35
Exercised, weighted average exercise price (in dollars per share)			$ 48.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			21 days
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit			$ 45.9
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit			$ 51.15
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	ten-year
Non-Employee Directors' Deferred Compensation Plan [Member]
Non-Employee Directors' Stock Grant And Deferred Compensation [Abstract]
Share-based Payment Arrangement, Expensed and Capitalized, Amount	$ 125,000	$ 125,000	$ 125,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	74,632
Other Employee Plans [Member]
Non-Employee Directors' Stock Grant And Deferred Compensation [Abstract]
Defined Contribution Plan, Cost	$ 2,600,000	$ 3,000,000.0	$ 2,500,000
Unissued Partnership Units Under Unit Option Deferral Election Member
Employee service share-based compensation, aggregate disclosures [Abstract]
Options exercised under unit option deferral election plan (in shares)	3,000,000.0
The number of mature units tendered for the exercise of previously issued stock options under the unit option deferral election plan (in shares)	2,100,000
The number of units deferred under the unit option deferral election upon the exercise of previously issued stock options (in shares)	900,000
Date at which deferred partnership units begin to be issued	December 2022
Number of Annual Installments during which Deferred Partnership Units will be issued	five
Minimum [Member] | Other Employee Plans [Member]
Non-Employee Directors' Stock Grant And Deferred Compensation [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Percent	0.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	2.00%
Defined Contribution Plan, Contribution Percent	0.00%
Maximum [Member] | Other Employee Plans [Member]
Non-Employee Directors' Stock Grant And Deferred Compensation [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Percent	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	5.00%
Defined Contribution Plan, Contribution Percent	9.00%
2012 and 2013 Special Grants [Member] | Performance Shares [Member]
Summary of non-option activity, additional disclosures [Abstract]
Actual Shares Issued Upon Vesting During Period			0