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Schedule II - Condensed Financial Information of Registrant - Subsequent Events - Additional Information (Detail) - $ / shares
3 Months Ended 12 Months Ended
Jan. 14, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent Event [Line Items]                                
Dividends per share declared on outstanding common stock   $ 0.27 $ 0.12 $ 0.12 $ 0.12 $ 0.25 $ 0.10 $ 0.10 $ 0.10 $ 0.23 $ 0.10 $ 0.08 $ 0.08 $ 0.63 $ 0.55 $ 0.49
Subsequent Event [Member]                                
Subsequent Event [Line Items]                                
Dividends per share declared on outstanding common stock $ 0.14                              
Dividend payable date Mar. 02, 2016                              
Dividends payable, shareholders record date Feb. 18, 2016