Reinsurance Recoverables (Detail) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Ceded Credit Risk [Line Items]
Reinsurance recoverables on paid losses		$ 63,900		$ 96,400
Ceded outstanding loss and LAE	[2]	1,857,400	[1]	1,650,100	$ 1,236,200	$ 1,169,300
Total		$ 1,921,278		$ 1,746,488

[1] Includes unallocated LAE, which aggregate to 1.1 percent of gross loss and LAE reserves as of December 31, 2018. Net loss and LAE reserves by component are shown in the preceding tables, and consolidated gross loss and LAE reserves is presented in the Consolidated Balance Sheets.

[2] Reinsurance recoverables in this table include only ceded loss and LAE reserves.