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Investments in Affiliated Companies (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]          
Maximum Ownership Percent Consider Under Cost Method Investments 20.00%   20.00%    
Other than Temporary Impairment Losses, Investments $ 0 $ 0 $ 0 $ 0  
Total investments in affiliated companies 61,000,000   61,000,000   $ 50,500,000
Dividends or Distributions Cost Method Investment 600,000 $ 300,000 600,000 $ 300,000  
Total equity method investments          
Investments in and Advances to Affiliates [Line Items]          
Total equity method investments 40,800,000   40,800,000   45,500,000
Total cost method investments          
Investments in and Advances to Affiliates [Line Items]          
Total cost method investments $ 20,200,000   $ 20,200,000   $ 5,000,000
Minimum [Member]          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investment, Ownership Percentage 20.00%   20.00%