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Note Investment in equity investees (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investment Summarized Financial Information Income Statement Abstract      
Income tax expense $ 119,579 $ 230,830 $ 78,784
Equity Method Investee      
Equity Method Investment Summarized Financial Information Income Statement Abstract      
Total revenues 1,074,055 931,627 852,160
Total expenses 673,632 663,069 634,173
Income tax expense 65,817 42,799 47,434
Net income 334,606 225,759 $ 170,553
Equity Method Investment Summarized Financial Information Abstract      
Total assets 8,652,539 8,439,622  
Total liabilities $ 6,090,722 $ 6,009,911