Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended				12 Months Ended
	Jan. 13, 2017	Dec. 14, 2016	May 09, 2014	Jun. 30, 2015	May 31, 2015	Apr. 30, 2015	May 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	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
Number of shares sold during period							25,875,000	1,070	34,780,622	28,275,006
Plan adoption date								Mar. 25, 2014
Common stock, shares issued under dividend reinvestment program								1,070	597	6
Net proceeds from issuance of class A common stock								$ 27	$ 1,029,540	$ 766,138
Dividends declared per share of common stock		$ 0.62						$ 2.48	$ 2.28	$ 1.98
Date of dividend paid								Jan. 13, 2017
Date of dividend declared								Dec. 14, 2016
Record date of dividend paid								Dec. 30, 2016
Accumulated other comprehensive loss								$ 56,202	$ 32,758
Net realized and unrealized gains related to changes in fair value of derivative instruments								51,300	25,000
Cumulative unrealized currency translation adjustment on assets and liabilities denominated in foreign currencies								$ 107,500	$ 57,800
Subsequent Events [Member]
Class of Stock [Line Items]
Dividends paid	$ 58,600
Dividends paid per common stock	$ 0.62
Class A Common Stock [Member]
Class of Stock [Line Items]
Number of shares sold during period				11,500,000	280,025	23,000,000		0	34,780,025
Common stock, shares issued under dividend reinvestment program								1,070	597	6
Net proceeds from issuance of class A common stock				$ 337,918	$ 7,895	$ 683,722			$ 1,029,535
ATM Agreements [Member]
Class of Stock [Line Items]
Number of shares sold during period								0	280,025
Aggregate sales price			$ 200,000
Net proceeds from issuance of class A common stock									$ 7,900
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								9,998,327			10,000,000