Corporate Borrowings and Capital Lease Obligations - Indebtedness Outstanding Summary (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Unamortized loan fees	$ (636)	$ (384)
Total	33,460	9,899
Less current maturities of long term debt	(3,345)	(2,613)
Long-term debt	$ 7,579	$ 7,286
Wells Fargo Bank [Member]
Debt Instrument [Line Items]
Credit Agreement, interest rate (as a percent)	2.315%	2.315%
Line of Credit [Member] | Wells Fargo Bank [Member]
Debt Instrument [Line Items]
Credit Agreement (Variable interest rate)	$ 23,172	$ 0
Line of Credit [Member] | Fixed Asset Sub Line Facility [Member]
Debt Instrument [Line Items]
Credit Agreement (Variable interest rate)	$ 6,254	$ 6,670
Credit Agreement, interest rate (as a percent)	2.693%	2.693%
Secured Debt [Member] | Secured Promissory Note Due 2022 [Member]
Debt Instrument [Line Items]
Secured Promissory Note	$ 2,670	$ 0
Interest rate (as a percent)	3.71%	3.71%
Secured Debt [Member] | Secured Promissory Note Due 2016 [Member]
Debt Instrument [Line Items]
Secured Promissory Note	$ 36	$ 404
Interest rate (as a percent)	6.89%	6.89%
US Bancorp [Member]
Debt Instrument [Line Items]
Capital Lease Obligation, 2.61%, due 2017	$ 1,964	$ 3,209
Capital Lease interest rate (as a percent)	2.61%	2.61%
Total [Member]
Debt Instrument [Line Items]
Long-term debt	$ 30,115	$ 7,286