Debt - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Apr. 01, 2014	Dec. 31, 2014	Jun. 28, 2013	Mar. 15, 2017	May 01, 2015	Feb. 11, 2015	Sep. 30, 2014	Apr. 29, 2015
Line of Credit Facility [Line Items]
Outstanding borrowings under its revolving line of credit	$ 71,000,000	$ 91,000,000		$ 71,000,000
Line of Credit bears interest at BMO Bank's LIBOR rate	1.66%	1.67%		1.66%
Remaining outstanding balance	7,000,000	11,400,000		7,000,000
Percentage of applicable margin interest rate	3.25%	3.25%		3.25%
Unused and available line of credit balance	21,200,000	21,500,000		21,200,000
Initial transaction costs related to indenture agreement	1,400,000
Net proceeds after initial transaction costs	53,600,000
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]
Percentage of revolving unused line fee			0.25%
Term Loan B Debt [Member]
Line of Credit Facility [Line Items]
Line of credit, LIBOR		LIBOR plus 4.50%		LIBOR plus 4.50%
Outstanding borrowings under its revolving line of credit	4,028,000	3,611,000		4,028,000
Percentage of applicable margin interest rate	4.67%	4.68%		4.67%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit, interest at LIBOR		0.045%		0.045%
Minimum [Member] | Wells Fargo Bank, N.A [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%		0.00%
Line of credit, interest at LIBOR			1.50%		1.50%
Maximum [Member] | Wells Fargo Bank, N.A [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%		0.50%
Line of credit, interest at LIBOR			2.00%		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%
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Proforma consolidated EBITDA						35,000,000
Proforma ratio of consolidated EBITDA						1
Debt instrument principal amount percentage including accrued and unpaid interest						100.00%
Debt instrument accrued percentage							5.50%
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
Line of credit, interest at LIBOR		0.18%	4.50%
Amortization period			36 months
Line of credit facility covenants maximum debt leverage ratio		4.0
Line of credit facility covenants minimum fixed charge coverage ratio		1
Line of credit, LIBOR			LIBOR plus 4.50%
Credit agreement maturity date		Jun. 28, 2018
Senior notes matures		75 days
Senior notes closing period		90 days
Amended Wells Credit Agreement I [Member] | Term Loan B Debt [Member]
Line of Credit Facility [Line Items]
Long term borrowings			5,000,000
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] | Minimum [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit			75,000,000
Amended Wells Credit Agreement I [Member] | Maximum [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit			90,000,000
Notes payable [Member] | Amended Wells Credit Agreement I [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Senior notes issuance percentage										5.50%
Five Point Five Zero Percent Senior Notes [Member]
Line of Credit Facility [Line Items]
Aggregate purchase amount on agreement with institutional investors	$ 55,000,000
Closing date of sale of agreement	Apr. 29, 2015
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.
Five Point Five Zero Percent Senior Notes [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Redeemable percentage on senior notes							101.00%
Debt instrument, redemption price, percentage of principal amount redeemed							105.00%
Percentage of principal amount, plus accrued and unpaid interest with proceeds of certain equity offerings							65.00%
Five Point Five Zero Percent Senior Notes [Member] | Subsequent Event [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Redeemable percentage on senior notes							35.00%