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Debt instrument issued price percentage of principal.

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Debt instrument stated LIBOR floor rate.

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Expected project completion period.

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The additional borrowing capacity under the line of credit facility.

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Percentage of capital stock of foreign subsidiary secured by pledge under revolving credit facilities.

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Percentage of loan to value of certain specified real property assets secured by first lien under term loan facilities.

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Sublimit for issuance of standby letters of credit.

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Short-Term financing which is expected to be paid back relatively quickly, such as by a subsequent longer-term loan. Also called swing loan or bridge financing.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Amount, after accumulated amortization, of debt discount.

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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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Debt - Additional Information (Detail)							1 Months Ended			3 Months Ended
Debt - Additional Information (Detail)	Jan. 02, 2020 USD ($)	Dec. 18, 2019 USD ($)	Aug. 23, 2018 USD ($) ft²	Apr. 20, 2018 USD ($)	Apr. 17, 2018 USD ($)	Jan. 19, 2018 USD ($) ft²	Oct. 31, 2017 USD ($)	Sep. 30, 2015 USD ($)	Apr. 30, 2013 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Apr. 30, 2021 USD ($)	Apr. 14, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt maturity period					Apr. 30, 2023
Borrowings outstanding under credit facility										$ 199,000,000.0
Total debt										1,779,572,000				$ 1,809,517,000
Debt Instrument outstanding balance										1,779,572,000				1,809,517,000
Unamortized original issue discount										9,375,000				10,000,000
Purchase price of real estate	$ 83,200,000
Business acquisition assumed in-place financing	$ 52,200,000										$ 52,217,000
Capital Commerce Center
Debt Instrument [Line Items]
Area of Building Acquired \| ft²						261,000
Purchase price of real estate						$ 44,700,000
Non-Recourse Mortgage Note \| Capital Commerce Center
Debt Instrument [Line Items]
Debt Instrument outstanding balance										20,600,000
Debt instrument, term						15 years
Stated interest rate						4.50%
Capitalized loan costs						$ 400,000
Amount of acquisition financed with non-recourse mortgage note						$ 24,500,000
Mortgage note maturity date						2033-01
Non-Recourse Senior Secured Notes \| Private Placement
Debt Instrument [Line Items]
Debt maturity date				Jan. 31, 2040
Debt Instrument outstanding balance										156,600,000
Debt instrument, term				20 years
Aggregate principal amount				$ 159,500,000
Stated interest rate				4.43%
Expected project completion period				January 2020
Notes issuance costs				$ 3,400,000
Non-Recourse Senior Secured Notes \| SSA-Baltimore
Debt Instrument [Line Items]
Debt maturity date			Feb. 28, 2034
Debt Instrument outstanding balance										143,000,000.0
Stated interest rate			4.50%
Area of Building Acquired \| ft²			541,000
Purchase price of real estate			$ 242,000,000.0
Notes issuance costs			200,000
Business acquisition assumed in-place financing			157,300,000
Balloon payment			$ 40,000,000.0
Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 1,000,000,000.0
Debt maturity period					Apr. 30, 2023
Line of credit facility, aggregate principal amount of additional borrowing					$ 350,000,000.0
Percentage of capital stock of foreign subsidiary secured by pledge under Revolving Credit Facilities					65.00%
Credit Agreement \| Term Loan A Due in April 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 200,000,000.0
Term Loan A Due in April 2023
Debt Instrument [Line Items]
Total debt										$ 177,500,000
Debt maturity date					Apr. 30, 2023					Apr. 30, 2023
Debt Instrument outstanding balance										$ 177,500,000				180,000,000
Term Loan B Due in December 2024
Debt Instrument [Line Items]
Total debt										$ 232,800,000
Debt maturity date		Dec. 31, 2024								Dec. 31, 2024
Debt Instrument outstanding balance		$ 250,000,000.0								$ 232,813,000				237,500,000
Debt instrument, term		5 years
Percentage of loan to value of certain specified real property assets secured by a first lien		80.00%
Debt instrument, issued price percentage of principal		95.00%
Unamortized original issue discount		$ 12,500,000
Capitalized loan costs		$ 5,100,000
Term Loan B Due in December 2024 \| Base Rate
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate		3.50%
Term Loan B Due in December 2024 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate		4.50%
Libor floor rate		1.00%
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Aggregate principal amount		$ 325,000,000.0
Stated interest rate		4.125%
Debt instrument redemption percentage of par									100.00%
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Debt maturity date									May 01, 2023	May 31, 2023
Debt Instrument outstanding balance										$ 350,000,000				350,000,000
Aggregate principal amount									$ 350,000,000.0
Stated interest rate									4.625%	4.625%
Debt instrument redemption percentage of par									100.00%
Senior Notes 4.625% Due 2023 \| Subsequent Event
Debt Instrument [Line Items]
Stated interest rate												4.625%
Senior Notes 5.0% Due 2022
Debt Instrument [Line Items]
Debt maturity date								Oct. 15, 2022		Oct. 31, 2022
Debt Instrument outstanding balance										$ 250,000,000				250,000,000
Aggregate principal amount								$ 250,000,000.0
Stated interest rate								5.00%		5.00%
Debt instrument redemption percentage of par								100.00%
Senior Notes 5.0% Due 2022 \| Subsequent Event
Debt Instrument [Line Items]
Stated interest rate												5.00%
Senior Notes 4.75% Due 2027
Debt Instrument [Line Items]
Debt maturity date							Oct. 15, 2027			Oct. 31, 2027
Debt Instrument outstanding balance										$ 250,000,000				$ 250,000,000
Aggregate principal amount							$ 250,000,000.0
Stated interest rate							4.75%			4.75%
Debt instrument redemption percentage of par							100.00%
8.25% Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount												$ 450,000,000.0	$ 450,000,000.0
Stated interest rate													8.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Sublimit swing line loans					$ 30,000,000.0
Percentage of commitment fee to unfunded balance										0.35%
Line of credit facility, remaining borrowing capacity										$ 587,100,000
Sublimit for issuance of standby letters of credit					$ 50,000,000.0
Revolving Credit Facility letters of credit outstanding										$ 13,900,000
Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate										0.50%
Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate					0.00%
Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate					1.00%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate										1.50%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate					1.00%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate					2.00%
Revolving Credit Facility \| Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 800,000,000.0