Financial Instruments and Fair Value Measurements - Summary of Gains (Losses) From Change in Fair Value of Derivative Instruments Included in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total derivative instruments	$ 54,111	$ 46,477	$ 115,666
Total derivative and nonderivative hedging instruments	166,702	367,625	436,862
Designated As Hedging Instrument [Member] | Derivative Net Investment Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total derivative instruments	55,460	63,934	122,164
Designated As Hedging Instrument [Member] | Interest Rate and Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total derivative instruments	(551)	(21,714)	(804)
Designated As Hedging Instrument [Member] | Our Share of Derivatives from Unconsolidated Co-Investment Ventures [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total derivative instruments	(798)	4,257	(5,694)
Non-Derivative Net Investment Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Nonderivative net investment hedges	$ 112,591	$ 321,148	$ 321,196