Schedule IV - Reinsurance (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross earned premium amounts	$ 86,325,000	$ 79,964,000	$ 75,968,000
Ceded earned premium amounts to other companies
Assumed amounts from other companies	38,000	189,000	259,000
Net earned premium amounts	86,363,000	80,153,000	76,227,000
Fully-insured dental HMO/Indemnity [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross earned premium amounts	46,656,000	43,844,000	42,527,000
Ceded earned premium amounts to other companies
Assumed amounts from other companies
Net earned premium amounts	46,656,000	43,844,000	42,527,000
Fully-insured dental PPO [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross earned premium amounts	13,456,000	11,240,000	9,298,000
Ceded earned premium amounts to other companies
Assumed amounts from other companies	38,000	189,000	259,000
Net earned premium amounts	13,494,000	11,429,000	9,557,000
Self-insured dental [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross earned premium amounts	25,641,000	24,380,000	23,650,000
Ceded earned premium amounts to other companies
Assumed amounts from other companies
Net earned premium amounts	25,641,000	24,380,000	23,650,000
Corporate, all other [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross earned premium amounts	572,000	500,000	493,000
Ceded earned premium amounts to other companies
Assumed amounts from other companies
Net earned premium amounts	$ 572,000	$ 500,000	$ 493,000