• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Investments - Summary of Unaudited Financial Information and Unaudited Financial Position of Limited Partnerships (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating results:                              
Total income $ 61,623 $ 47,490 $ 67,580 $ 67,713 $ 72,371 $ 69,808 $ 61,520 $ 60,747 $ 63,412 $ 61,262 $ 79,068 $ 82,210 $ 244,406 $ 264,446 $ 285,952
Total expenses 44,676 $ 113,508 $ 53,275 $ 48,571 66,470 $ 49,779 $ 50,291 $ 51,050 $ 45,787 $ 49,324 $ 43,485 $ 41,164      
Limited Partnership [Member]                              
Operating results:                              
Total income                         409,169 310,998 4,350
Total expenses                         105,281 185,126 77,508
Net income (loss)                         303,888 125,872 $ (73,158)
Balance Sheet:                              
Total assets 4,381,321       2,956,327               4,381,321 2,956,327  
Total liabilities $ 382,310       $ 63,813               $ 382,310 $ 63,813