Insurance Operations - Statutory Capital and Surplus, and an Amount Representing Ten Percent of Total Liabilities for both UPCIC and APPCIC (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
UPCIC [Member]
Statutory Accounting Practices [Line Items]
Ten percent of total liabilities	$ 65,976	$ 55,928
Statutory capital and surplus	311,202	256,987
APPCIC [Member]
Statutory Accounting Practices [Line Items]
Ten percent of total liabilities	512	463
Statutory capital and surplus	$ 14,967	$ 14,777