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Equity Investments - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity Method Investments And Joint Ventures [Abstract]      
Impairment related to minority equity investment $ 14,993    
Equity investments in nonconsolidated businesses 502,389 $ 78,368  
Equity investment income $ 13,044 $ 18,325 $ 23,234