Debt - Additional Information (Detail) - USD ($)							3 Months Ended	12 Months Ended
	Dec. 31, 2015	May. 01, 2015	Apr. 29, 2015	Apr. 24, 2015	Apr. 01, 2014	Jun. 28, 2013	Dec. 31, 2014	Dec. 31, 2015	Feb. 11, 2015	Sep. 30, 2014
Line of Credit Facility [Line Items]
Outstanding borrowings under its revolving line of credit	$ 97,000,000						$ 71,000,000	$ 97,000,000
Line of Credit bears interest at BMO Bank's LIBOR rate	1.84%						1.66%	1.84%
Financing costs related to indenture agreement				$ 1,517,000
Net proceeds after transaction costs				53,483,000
Outstanding balance, net of unamortized financing fees	$ 53,820,000						$ 2,361,000	$ 53,820,000
Certain events of bankruptcy, redemption percentage of principal amount of notes outstanding with accrued and unpaid interest								25.00%
Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit					$ 5,000,000
Long term borrowings					$ 5,000,000
Amended Wells Credit Agreement I [Member]
Line of Credit Facility [Line Items]
Amortization period					36 months
Line of credit facility covenants maximum debt leverage ratio								4.0
Credit agreement maturity date								Jun. 28, 2018
Senior notes matures								75 days
Senior notes closing period								90 days
Amended Wells Credit Agreement I [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit, interest at LIBOR					4.50%
Amended Wells Credit Agreement I [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility covenants minimum fixed charge coverage ratio								1.20
Amended Wells Credit Agreement I [Member] | Wells Fargo Bank, N.A [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Applicable margin, during the period					0.00%
Amended Wells Credit Agreement I [Member] | Wells Fargo Bank, N.A [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit					$ 90,000,000
Applicable margin, during the period					0.50%
Amended Wells Credit Agreement I [Member] | Notes payable [Member]
Line of Credit Facility [Line Items]
Senior notes issuance percentage			5.50%
Debt instrument maturity date			Mar. 15, 2017
Debt instrument maturity date			Jan. 31, 2018
Secured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Remaining outstanding balance	$ 299,000						$ 71,000,000	$ 299,000
Percentage of applicable margin interest rate	3.50%						3.25%	3.50%
Unused and available line of credit balance	$ 27,100,000						$ 21,200,000	$ 27,100,000
Secured Revolving Credit Facility [Member] | Wells Fargo Bank, N.A [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit						$ 75,000,000
Applicable margin, during the period						0.00%
Line of credit, interest at LIBOR						1.50%
Line of credit facility covenants minimum fixed charge coverage ratio						1.0
Secured Revolving Credit Facility [Member] | Wells Fargo Bank, N.A [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit						$ 100,000,000
Applicable margin, during the period						0.50%
Line of credit, interest at LIBOR						2.00%
Percentage of revolving unused line fee						0.25%
Consecutive days of liquidity threshold						60 days
Liquidity threshold						$ 9,375,000
Percent of total credit facility						12.50%
Secured Revolving Credit Facility [Member] | Amended Wells Credit Agreement I [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit									$ 125,000,000	$ 100,000,000
Secured Revolving Credit Facility [Member] | Amended Wells Credit Agreement I [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Percentage of revolving unused line fee					0.25%
Secured Revolving Credit Facility [Member] | Amended Wells Credit Agreement I [Member] | Wells Fargo Bank, N.A [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit					$ 75,000,000
Line of credit, interest at LIBOR					1.50%
Secured Revolving Credit Facility [Member] | Amended Wells Credit Agreement I [Member] | Wells Fargo Bank, N.A [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit, interest at LIBOR					2.00%
Term Loan B Debt [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings under its revolving line of credit							$ 4,028,000
Percentage of applicable margin interest rate							4.67%
Term Loan B Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit, interest at LIBOR							4.50%
Term Loan B Debt [Member] | Amended Wells Credit Agreement I [Member]
Line of Credit Facility [Line Items]
Long term borrowings					$ 5,000,000
5.50% Senior Notes [Member]
Line of Credit Facility [Line Items]
Outstanding balance, net of unamortized financing fees	53,820,000							$ 53,820,000
Proforma ratio of consolidated EBITDA								3.25
Debt instrument principal amount percentage including accrued and unpaid interest								100.00%
Debt instrument accrued percentage		5.50%
Unpaid interest	$ 513,000							$ 513,000
5.50% Senior Notes [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Proforma consolidated EBITDA								$ 35,000,000
5.50% Senior Notes [Member] | Notes payable [Member]
Line of Credit Facility [Line Items]
Aggregate purchase amount on agreement with institutional investors				$ 55.0
Closing date of sale of agreement				Apr. 29, 2015
Redeemable percentage on senior notes	101.00%
Debt instrument, redemption price, percentage of principal amount redeemed	105.50%
Percentage of principal amount, plus accrued and unpaid interest with proceeds of certain equity offerings	65.00%
Debt instrument redemption description								the Company may redeem up to 35% of the Senior Notes with the net cash proceeds of certain equity offerings specified in the Indenture at a redemption price of 105.5% of the principal amount of the Senior Notes, together with accrued and unpaid interest to the date of redemption, but only if at least 65% of the original aggregate principal amount of the Senior Notes would remain outstanding following such redemption. In addition, prior to May 1, 2016, the Company may redeem the Senior Notes in whole or in part at a redemption price equal to 101.0% of the principal amount plus (i) accrued and unpaid interest to the redemption date and (ii) an Applicable Premium (as defined in the Indenture) that is intended as a “make-whole” to May 1, 2016
5.50% Senior Notes [Member] | Notes payable [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Redeemable percentage on senior notes	35.00%