Other Intangible Assets - Other Intangible Assets (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 8,901,000	$ 8,901,000
Amortization Expense	327,000	437,000
Accumulated Amortization	5,377,000	5,050,000
Cost, Net of Accumulated Amortization	$ 3,524,000	$ 3,851,000
Covenants Not to Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Life	5 years	5 years
Cost	$ 775,000	$ 775,000
Amortization Expense	0	0
Accumulated Amortization	775,000	775,000
Cost, Net of Accumulated Amortization	0	0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	7,922,000	7,922,000
Amortization Expense	317,000	423,000
Accumulated Amortization	4,461,000	4,144,000
Cost, Net of Accumulated Amortization	$ 3,461,000	$ 3,778,000
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Life	18 years	18 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Life	20 years	20 years
TPA Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Life	15 years	15 years
Cost	$ 204,000	$ 204,000
Amortization Expense	10,000	14,000
Accumulated Amortization	141,000	131,000
Cost, Net of Accumulated Amortization	$ 63,000	$ 73,000