• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
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, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating results:                              
Total income $ 52,997 $ 61,743 $ 58,813 $ 57,739 $ 61,623 $ 47,490 $ 67,580 $ 67,713 $ 72,371 $ 69,808 $ 61,520 $ 60,747 $ 231,292 $ 244,406 $ 264,446
Limited Partnership [Member]                              
Operating results:                              
Total income                         1,821,935 409,169 310,998
Total expenses                         146,079 105,281 185,126
Net income (loss)                         1,675,856 303,888 $ 125,872
Balance Sheet:                              
Total assets 6,689,792       4,381,321               6,689,792 4,381,321  
Total liabilities $ 394,029       $ 382,310               $ 394,029 $ 382,310