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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Billions
Apr. 24, 2017
Apr. 01, 2017
Oaktree [Member]    
Subsequent Event [Line Items]    
Control percentage by Oaktree   42.00%
Subsequent Events [Member]    
Subsequent Event [Line Items]    
Total purchase price $ 4.2  
Business combination, equity value 3.2  
Business combination, assumption of debt $ 1.1  
Subsequent Events [Member] | Common Stock [Member]    
Subsequent Event [Line Items]    
Price of shares issued $ 40.25