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Debt - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | May. 01, 2015 | Apr. 29, 2015 | Apr. 24, 2015 | Apr. 01, 2014 | Jun. 28, 2013 | Dec. 31, 2014 | Sep. 30, 2015 | Feb. 11, 2015 | Sep. 30, 2014
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding borrowings under its revolving line of credit | $ 99,000,000 |  |  |  |  |  | $ 71,000,000 | $ 99,000,000 |  |
Line of Credit bears interest at BMO Bank's LIBOR rate | 1.70% |  |  |  |  |  | 1.66% | 1.70% |  |
Transaction costs related to indenture agreement |  |  |  | $ 1,500,000 |  |  |  |  |  |
Net proceeds after transaction costs |  |  |  | 53,500,000 |  |  |  |  |  |
Certain events of bankruptcy, redemption percentage of principal amount of notes outstanding with accrued and unpaid interest |  |  |  |  |  |  |  | 25.00% |  |
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 | $ 61,000 |  |  |  |  |  | $ 7,000,000 | $ 61,000 |  |
Percentage of applicable margin interest rate | 3.25% |  |  |  |  |  | 3.25% | 3.25% |  |
Unused and available line of credit balance | $ 13,400,000 |  |  |  |  |  | $ 21,200,000 | $ 13,400,000 |  |
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] |  |  |  |  |  |  |  |  |  |
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 | $ 1,302,000 |  |  |  |  |  |  | $ 1,302,000 |  |
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 |  |  |  | $ 55,000,000 |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |

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