Debt - Summary of Outstanding Indebtedness (Details)	6 Months Ended
Jun. 30, 2021 USD ($) property extension_option	Dec. 31, 2020 USD ($)
Debt Instrument
Duration used in interest rate calculation (in days)	360 days
Hollywood Media Portfolio \| Investee
Debt Instrument
Notes receivable	$ 107,800,000
Hollywood Media Portfolio \| Investee \| Blackstone
Debt Instrument
Notes receivable	$ 12,500,000
Hollywood Media Portfolio
Debt Instrument
VIE, ownership Interest	51.00%
1918 Eighth
Debt Instrument
VIE, ownership Interest	55.00%
Hill7
Debt Instrument
VIE, ownership Interest	55.00%
One Westside and 10850 Pico \| VIE, primary beneficiary
Debt Instrument
VIE, ownership Interest	75.00%
Interest rate swaps \| Designated as hedging Instrument
Debt Instrument
Notional amount	$ 475,000,000.0	$ 475,000,000.0
10950 Washington
Debt Instrument
Service payment term (in years)	30 years
Hollywood Media Portfolio B \| Interest rate swaps \| Designated as hedging Instrument
Debt Instrument
Notional amount	$ 350,000,000
Hollywood Media Portfolio B \| LIBOR \| Interest rate swaps \| Designated as hedging Instrument
Debt Instrument
Derivative, basis spread on variable rate	1.76%
Hollywood Media Portfolio D \| Interest rate swaps \| Designated as hedging Instrument
Debt Instrument
Notional amount	$ 125,000,000
Hollywood Media Portfolio D \| LIBOR \| Interest rate swaps \| Designated as hedging Instrument
Debt Instrument
Derivative, basis spread on variable rate	1.43%
Unsecured and Secured Debt
Debt Instrument
Debt	$ 3,518,813,000	3,432,276,000
Unamortized deferred financing costs and loan discounts/premium	(27,770,000)	(32,784,000)
TOTAL UNSECURED AND SECURED DEBT, NET	3,491,043,000	3,399,492,000
Unsecured debt
Debt Instrument
Debt	1,925,000,000	1,925,000,000
Unsecured debt \| Series A notes
Debt Instrument
Debt	$ 110,000,000	110,000,000
Interest rate	4.34%
Unsecured debt \| Series B notes
Debt Instrument
Debt	$ 259,000,000	259,000,000
Interest rate	4.69%
Unsecured debt \| Series C notes
Debt Instrument
Debt	$ 56,000,000	56,000,000
Interest rate	4.79%
Unsecured debt \| Series D notes
Debt Instrument
Debt	$ 150,000,000	150,000,000
Interest rate	3.98%
Unsecured debt \| Series E notes
Debt Instrument
Debt	$ 50,000,000	50,000,000
Interest rate	3.66%
Unsecured debt \| 3.95% Registered senior notes
Debt Instrument
Debt	$ 400,000,000	400,000,000
Interest rate	3.95%
Unsecured debt \| 4.65% Registered senior notes
Debt Instrument
Debt	$ 500,000,000	500,000,000
Interest rate	4.65%
Unsecured debt \| 3.25% Registered senior notes
Debt Instrument
Debt	$ 400,000,000	400,000,000
Interest rate	3.25%
Unsecured debt \| Revolving credit facility
Debt Instrument
Debt	$ 0	0
Total borrowing capacity	$ 600,000,000	600,000,000
Extension term (in years)	1 year
Unsecured debt \| Revolving credit facility \| LIBOR \| Low
Debt Instrument
Basis spread on variable rate	1.05%
Unsecured debt \| Revolving credit facility \| LIBOR \| High
Debt Instrument
Basis spread on variable rate	1.50%
Secured debt
Debt Instrument
Debt	$ 1,593,813,000	1,507,276,000
Secured debt \| Hollywood Media Portfolio, net
Debt Instrument
Debt	$ 792,186,000	792,186,000
Extension term (in years)	1 year
Face amount	$ 900,000,000.0
Debt instrument, term (in years)	2 years
Debt instrument, number of extension options \| property	3
Secured debt \| Hollywood Media Portfolio, net \| LIBOR
Debt Instrument
Basis spread on variable rate	2.15%
Secured debt \| 10950 Washington
Debt Instrument
Debt	$ 25,404,000	25,717,000
Interest rate	5.32%
Secured debt \| One Westside and 10850 Pico
Debt Instrument
Debt	$ 192,923,000	106,073,000
Face amount	$ 414,600,000
Secured debt \| One Westside and 10850 Pico \| LIBOR
Debt Instrument
Basis spread on variable rate	1.70%
Secured debt \| Element LA
Debt Instrument
Debt	$ 168,000,000	168,000,000
Interest rate	4.59%
Secured debt \| 1918 Eighth
Debt Instrument
Debt	$ 314,300,000	314,300,000
Debt instrument, term (in years)	5 years
Secured debt \| 1918 Eighth \| LIBOR
Debt Instrument
Basis spread on variable rate	1.70%
Secured debt \| Hill7
Debt Instrument
Debt	$ 101,000,000	101,000,000
Interest rate	3.38%
In-substance defeased debt
Debt Instrument
Debt	$ 129,971,000	131,707,000
TOTAL UNSECURED AND SECURED DEBT, NET	$ 129,971,000	131,707,000
Interest rate	4.47%
Service payment term (in years)	10 years
Joint venture partner debt
Debt Instrument
Debt	$ 66,136,000	66,136,000
TOTAL UNSECURED AND SECURED DEBT, NET	$ 66,136,000	$ 66,136,000
Interest rate	4.50%
Debt instrument, number of extension options \| extension_option	2
Debt Instrument, first renewal term (in years)	2 years
Debt Instrument, second renewal term (in years)	2 years

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Debt Instrument, Extension Option, Term

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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