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Dividend Restrictions - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Debt repositioning charge, net of tax   $ 546,800  
Net (loss) income $ 495,401 $ (47,156) $ 485,397
Dividend paid to the Parent Company 330,000    
Additional dividends that could have been paid to the Parent Company without regulatory approval $ 220,000