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Debt - Additional Information (Detail)					1 Months Ended			3 Months Ended
Debt - Additional Information (Detail)	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 ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Borrowings outstanding under credit facility								$ 214,000,000.0
Total debt								1,856,060,000	$ 1,814,795,000
Debt Instrument outstanding balance								1,856,060,000	1,814,795,000
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]
Stated interest rate				4.50%
Amount of acquisition financed with non-recourse mortgage note				$ 24,500,000
Mortgage note maturity date				2033-01
Mortgage note maturity term				15 years
Capitalized loan costs				$ 400,000
Debt Instrument outstanding balance								23,100,000
Non-Recourse Senior Secured Notes \| Private Placement
Debt Instrument [Line Items]
Debt maturity date		Jan. 31, 2040
Aggregate principal amount		$ 159,500,000
Stated interest rate		4.43%
Mortgage note maturity term		20 years
Debt Instrument outstanding balance								93,500,000
Expected project completion period		first quarter of 2020
Notes issuance costs		$ 3,400,000
Non-Recourse Senior Secured Notes \| SSA-Baltimore
Debt Instrument [Line Items]
Debt maturity date	Feb. 28, 2034
Stated interest rate	4.50%
Area of Building Acquired \| ft²	541,000
Purchase price of real estate	$ 242,000,000.0
Debt Instrument outstanding balance								154,200,000
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
Credit Agreement \| Term Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			200,000,000.0
Term Loan Due in April 2023
Debt Instrument [Line Items]
Total debt								$ 196,300,000
Debt maturity date								Apr. 30, 2023
Debt Instrument outstanding balance								$ 196,250,000	197,500,000
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Debt maturity date							Apr. 01, 2020	Apr. 01, 2020
Aggregate principal amount							$ 325,000,000.0
Stated interest rate							4.125%	4.125%
Debt instrument redemption percentage of par							100.00%
Debt Instrument outstanding balance								$ 325,000,000	325,000,000
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Debt maturity date							May 01, 2023	May 01, 2023
Aggregate principal amount							$ 350,000,000.0
Stated interest rate							4.625%	4.625%
Debt instrument redemption percentage of par							100.00%
Debt Instrument outstanding balance								$ 350,000,000	350,000,000
Senior Notes 5.0% Due 2022
Debt Instrument [Line Items]
Debt maturity date						Oct. 15, 2022		Oct. 15, 2022
Aggregate principal amount						$ 250,000,000.0
Stated interest rate						5.00%		5.00%
Debt instrument redemption percentage of par						100.00%
Debt Instrument outstanding balance								$ 250,000,000	250,000,000
Senior Notes 4.75% Due 2027
Debt Instrument [Line Items]
Debt maturity date					Oct. 15, 2027			Oct. 15, 2027
Aggregate principal amount					$ 250,000,000.0
Stated interest rate					4.75%			4.75%
Debt instrument redemption percentage of par					100.00%
Debt Instrument outstanding balance								$ 250,000,000	$ 250,000,000
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								$ 562,300,000
Sublimit for issuance of standby letters of credit			$ 50,000,000.0
Revolving Credit Facility letters of credit outstanding								$ 23,700,000
Percentage of capital stock of foreign subsidiary secured by pledge under Revolving Credit Facilities			65.00%
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