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Unsecured Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended				9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	May 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Repayment of senior notes						$ 958,509	$ 240,000
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Unsecured term loan	$ 400,000	$ 400,000				$ 400,000
Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Specified spread line of credit facility	1.10%
3.9% Senior Unsecured Notes Due August 2024 [Member]
Debt Instrument [Line Items]
Senior notes issued			$ 350,000
Debt instrument interest rate			3.90%
Debt instrument maturity date			2024-08
Debt instrument, unamortized discount			$ 1,000
Debt instrument, issuance costs			$ 2,900
4.7% Senior Unsecured Notes Due June 2027 [Member]
Debt Instrument [Line Items]
Senior notes issued					$ 450,000
Debt instrument interest rate					4.70%
Debt instrument maturity date					2027-06
Debt instrument, unamortized discount					$ 800
Debt instrument, issuance costs					$ 4,000
4.75% Senior Unsecured Notes Due April 2018 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate				4.75%
Debt instrument maturity date				2018-04
Repayment of senior notes				$ 300,000
Payment on redemption of senior notes				$ 7,300
7.875% Senior Unsecured Notes Due September 2020 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	7.875%	7.875%				7.875%
Debt instrument maturity date		2020-09
Repayment of senior notes		$ 300,000
Payment on redemption of senior notes		51,200
Tranche A Loans [Member] | Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Unsecured term loan	$ 200,000	$ 200,000				$ 200,000
Term loan maturity date		2018-01
Extension maturity period		with two one-year extension options
Tranche B Loans [Member] | Unsecured Debt [Member] | Wells Fargo Bank National Association and PNC Bank National Association [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Unsecured term loan	$ 200,000	$ 200,000				$ 200,000
Term loan maturity date		2023-01

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