Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended
	Apr. 17, 2017	Mar. 15, 2017	May 09, 2014	May 31, 2013	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Mar. 25, 2014
Class of Stock [Line Items]
Total stock, shares authorized					300,000,000
Common stock, shares authorized					200,000,000		200,000,000
Preferred stock, shares authorized					100,000,000
Preferred stock issued					0
Preferred stock outstanding					0
Plan adoption date					Mar. 25, 2014
Common stock, shares issued under dividend reinvestment program					270	285
Number of shares sold during period				25,875,000	270	285
Dividends declared per share of common stock		$ 0.62			$ 0.62	$ 0.62
Date of dividend paid					Apr. 17, 2017
Date of dividend declared					Mar. 15, 2017
Record date of dividend paid					Mar. 31, 2017
Accumulated other comprehensive loss					$ 52,357		$ 56,202
Net realized and unrealized gains related to changes in fair value of derivative instruments					47,300		51,300
Cumulative unrealized currency translation adjustment on assets and liabilities denominated in foreign currencies					$ 99,700		$ 107,500
Subsequent Events [Member]
Class of Stock [Line Items]
Dividends paid	$ 58,800
Dividends paid per common stock	$ 0.62
ATM Agreements [Member]
Class of Stock [Line Items]
Aggregate sales price			$ 200,000
Number of shares sold during period					0	0
Aggregate sales price remaining available					$ 188,600
Dividend Reinvestment and Direct Stock Purchase Plan [Member]
Class of Stock [Line Items]
Reserved for issuance of class A common stock					9,998,057			10,000,000