Corporate Borrowings and Capital Lease Obligations - Indebtedness Outstanding Summary (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized loan fees(a)	$ (576)	$ (636)
Total	36,001	33,460
Less current maturities of long term debt	(4,359)	(3,345)
Long-term debt	$ 31,642	30,115
Wells Fargo Bank [Member]
Debt Instrument [Line Items]
Credit Agreement, interest rate (as a percent)	2.45%
Line of Credit [Member] \| Wells Fargo Bank [Member]
Debt Instrument [Line Items]
Credit Agreement (Variable interest rate)	$ 16,000	23,172
Line of Credit [Member] \| Fixed Asset Sub Line Facility [Member]
Debt Instrument [Line Items]
Credit Agreement (Variable interest rate)	$ 5,253	6,254
Credit Agreement, interest rate (as a percent)	2.86%
Term Loan [Member] \| Credit Agreement, Variable Rate Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 13,000	0
Interest rate (as a percent)	2.86%
Secured Debt [Member] \| Secured Promissory Note Due 2022 [Member]
Debt Instrument [Line Items]
Secured Promissory Note	$ 2,324	2,670
Interest rate (as a percent)	3.71%
Secured Debt [Member] \| Secured Promissory Note Due 2016 [Member]
Debt Instrument [Line Items]
Secured Promissory Note	$ 0	36
Interest rate (as a percent)	6.89%
US Bancorp [Member]
Debt Instrument [Line Items]
Capital Lease Obligation, 2.61%, due 2017	$ 0	$ 1,964
Capital Lease interest rate (as a percent)	2.61%

-- None. No documentation exists for this element. --

No definition available.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
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+ Details

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Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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+ Details

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Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

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- Definition

Amount of long-term debt and capital lease obligations including current maturities.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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