Other Intangible Assets - Other Intangible Assets (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018
Finite Lived Intangible Assets [Line Items]
Cost	$ 8,901,000	$ 8,901,000
Amortization Expense	331,000	437,000
Accumulated Amortization	5,818,000	5,486,000
Cost, Net of Accumulated Amortization	$ 3,083,000	$ 3,415,000
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	321,000	423,000
Accumulated Amortization	4,888,000	4,566,000
Cost, Net of Accumulated Amortization	$ 3,034,000	$ 3,356,000
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	155,000	145,000
Cost, Net of Accumulated Amortization	$ 49,000	$ 59,000