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Financial Instruments and Fair Value Measurements - Summary of Changes in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative translation adjustment $ (373,292) $ 225,631 $ (261,738) $ 307,530
Foreign currency translation gains (losses), net (147,813) 3,162 (143,043) 42,829
Total unrealized gains (losses) on derivative contracts, net 2,131 6,735 (4,156) 9,366
Total change in other comprehensive income (loss) (145,682) 9,897 (147,199) 52,195
Designated As Hedging Instrument [Member] | Derivative Net Investment Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total derivative hedging instruments 1,740 7,197 4,833 9,491
Designated As Hedging Instrument [Member] | Non derivative Net Investment Hedge [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Nonderivative financial instruments 223,739 (229,666) 113,862 (274,192)
Designated As Hedging Instrument [Member] | Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total derivative hedging instruments 963 4,559 (8,322) 4,988
Designated As Hedging Instrument [Member] | Our Share of Derivatives from Unconsolidated Co-Investment Ventures [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total derivative hedging instruments $ 1,168 $ 2,176 $ 4,166 $ 4,378