Intangible Assets Arising from Acquisitions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquired Intangible Assets Amortization [Line Items]
Cost and Net Value	$ 19,000	$ 19,000
Accumulated Amortization	2,721	27,693
Net Value	$ 23,079	23,607
Value of Business Acquired
Acquired Intangible Assets Amortization [Line Items]
Cost		25,500
Accumulated Amortization		$ 25,500
Agent Relationships
Acquired Intangible Assets Amortization [Line Items]
Useful Life	10 years	10 years
Cost	$ 900	$ 900
Accumulated Amortization	$ 179	$ 90
Trade names
Acquired Intangible Assets Amortization [Line Items]
Useful Life	7 years	7 years
Cost	$ 600	$ 600
Accumulated Amortization	173	$ 86
Maximum | Value of Business Acquired
Acquired Intangible Assets Amortization [Line Items]
Useful Life		1 year
State insurance licenses
Acquired Intangible Assets Amortization [Line Items]
Cost and Net Value	$ 10,000	$ 10,000
American Reliable Insurance Company
Acquired Intangible Assets Amortization [Line Items]
Cost		32,000
Accumulated Amortization		25,676
Net Value		6,324
American Reliable Insurance Company | Value of Business Acquired
Acquired Intangible Assets Amortization [Line Items]
Cost		25,500
Accumulated Amortization		25,500
Net Value		$ 0
American Reliable Insurance Company | Agent Relationships
Acquired Intangible Assets Amortization [Line Items]
Useful Life		10 years
Cost		$ 900
Accumulated Amortization		90
Net Value		$ 810
American Reliable Insurance Company | Trade names
Acquired Intangible Assets Amortization [Line Items]
Useful Life		7 years
Cost		$ 600
Accumulated Amortization		86
Net Value		$ 514
American Reliable Insurance Company | Maximum | Value of Business Acquired
Acquired Intangible Assets Amortization [Line Items]
Useful Life		1 year
American Reliable Insurance Company | State insurance licenses
Acquired Intangible Assets Amortization [Line Items]
Cost and Net Value		$ 5,000