Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Effective tax rate	32.50%	23.40%	16.40%	17.60%
Provision for income taxes	$ 2,889,000	$ 1,580,000	$ 4,220,000	$ 2,501,000
Minimum percentage of tax benefit settled for uncertain tax position			50.00%
Unrecognized tax benefits	$ 0	$ 0	$ 0	$ 0
HII
Income Taxes [Line Items]
Effective tax rate	29.10%		15.00%
HP
Income Taxes [Line Items]
Effective tax rate	3.70%		3.70%

[Line Items] for Income Taxes [Table]

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- Definition

The minimum percentage that is likely to be realized of the largest amount of tax benefit to be measured upon settlement of an uncertain tax position.

+ References

No definition available.

+ Details

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of unrecognized tax benefits.

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