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Commitments, Contingencies and Guarantees - Textual (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Temporary Equity [Line Items]      
Redeemable Noncontrolling Interests $ 51,546 $ 62,886  
Letters of credit outstanding, amount 4,701    
Operating leases, rent expense 65,093 64,086 $ 56,725
Operating leases, income statement, sublease revenue 3,671 $ 2,797 $ 3,027
Future sublease income receivable 15,930    
Investments [Member]      
Temporary Equity [Line Items]      
Investment commitments $ 40