Credit Facilities and Long-Term Debt - Debt Covenants - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jul. 08, 2015	Dec. 31, 2014	May. 31, 2014	Mar. 31, 2011
Great Plains [Member]
Summary of outstanding long-term debt balances
Debt Instrument, Collateral Amount				$ 3,100,000
Great Plains [Member] | Subsequent Event [Member]
Summary of outstanding long-term debt balances
Debt Instrument, Collateral Amount		$ 3,100,000
Sun Life Assurance Company of Canada [Member]
Summary of outstanding long-term debt balances
Interest coverage ratio	at least 2.0 to 1.0
Debt to capitalization rate	60.00%
Debt service reserve account	$ 900,000		$ 900,000
Maximum percentage of dividend distribution redemptions of net income	70.00%
Maximum capitalized leases and purchase money obligations					$ 500,000
Maximum limit for sale or transfer of assets	1.00%
Percentage of maximum limit of making acquisition	10.00%
Bank of America [Member]
Summary of outstanding long-term debt balances
Maximum debt to capital ratio	not more than .55-to-1.00
Interest coverage ratio	no less than 2.0-to-1.0
Maximum capital lease borrowing obligation	$ 500,000
Maximum other borrowing obligation	$ 1,000,000
Period consider for distribution and redemption restriction	60 months
Percent of net income consider for distribution and redemption restriction	80.00%
Maximum percent of assets disposal restriction in fiscal year	5.00%
Allstate/CUNA [Member]
Summary of outstanding long-term debt balances
Total dividends and distributions made in the immediately preceding period	60 months
Aggregate consolidated net income	100.00%
Debt to capitalization rate	65.00%
Debt Instrument Interest Coverage Ratio	150.00%