General form of registration statement for all companies including face-amount certificate companies

Quarterly Selected Financial Data (Detail)

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Quarterly Selected Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information [Line Items]                            
Total revenue $ 797,885 $ 503,171 $ 674,411 $ 583,234 $ 515,430 $ 488,594 $ 666,634 $ 568,586 $ 495,510 $ 1,969,949 $ 1,773,075 $ 2,276,246 $ 2,219,324 $ 2,012,128
Operating income 208,080 49,505 174,138 87,006 46,444 42,339 160,019 76,250 37,504 334,457 307,588 357,093 316,112 230,609
Net income (loss) $ 172,894 $ 1,053 [1] $ 128,188 $ 36,031 $ 3,284 $ (1,941) $ 107,509 $ 29,224 $ (7,933) $ 66,479 $ 167,503 $ 168,556 $ 126,859 $ 22,986
Earnings (loss) per share:                            
Basic and Diluted   $ 0.01 $ 0.72 $ 0.20 $ 0.02 $ (0.01) $ 0.60 $ 0.16 $ (0.04)          
[1] Includes a non-recurring share-based compensation charge of $4.5 million related to a former CEO.