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Revolving Line of Credit and Term Loan - Additional Information (Detail) (USD $) |  |  | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |  | 6 Months Ended | 0 Months Ended | 6 Months Ended |  | 0 Months Ended
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Term Loan B Debt [Member] | Apr. 01, 2014 Wells Fargo Bank, N.A [Member] | Apr. 01, 2014 Minimum [Member] Wells Fargo Bank, N.A [Member] | Jun. 28, 2013 Minimum [Member] Wells Fargo Bank, N.A [Member] | Jun. 30, 2014 Minimum [Member] Wells Fargo Bank, N.A [Member] | Apr. 01, 2014 Maximum [Member] Wells Fargo Bank, N.A [Member] | Jun. 28, 2013 Maximum [Member] Wells Fargo Bank, N.A [Member] | Jun. 30, 2014 Maximum [Member] Wells Fargo Bank, N.A [Member] | Apr. 01, 2014 Amended Wells Credit Agreement I [Member] | Jun. 30, 2014 Amended Wells Credit Agreement I [Member] | Apr. 01, 2014 Amended Wells Credit Agreement I [Member] Term Loan B Debt [Member] | Jun. 30, 2014 Amended Wells Credit Agreement I [Member] Minimum [Member] | Apr. 01, 2014 Amended Wells Credit Agreement I [Member] Minimum [Member] Wells Fargo Bank, N.A [Member] | Apr. 01, 2014 Amended Wells Credit Agreement I [Member] Maximum [Member] Wells Fargo Bank, N.A [Member] | Jun. 30, 2014 BMO Harris Bank N A prime rate [Member] | Mar. 20, 2012 BMO Harris Bank N A prime rate [Member] | Mar. 20, 2012 BMO Harris Bank N A prime rate [Member] Minimum [Member] | Mar. 20, 2012 BMO Harris Bank N A prime rate [Member] Maximum [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement provides for borrowings under a revolving line of credit |  |  |  |  |  | $ 75,000,000 |  |  | $ 100,000,000 |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Applicable margin, during the period |  |  |  |  | 0.00% | 0.00% |  | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  | 0.00% | 0.50%
Line of credit, interest at LIBOR |  |  | 4.66% |  | 1.50% | 1.50% |  | 2.00% | 2.00% |  | 4.50% | 0.16% |  |  |  |  |  |  | 1.75% | 2.25%
Percentage of revolving unused line fee |  |  |  | 0.25% |  |  |  |  | 0.25% |  |  |  |  |  |  |  | 0.25% |  |  |
Consecutive days of liquidity threshold |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |
Liquidity threshold |  |  |  |  |  |  |  |  | 9,375,000 |  |  |  |  |  |  |  |  | 7,500,000 |  |
Percent of total credit facility |  |  |  |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  | 50.00% |  |
Line of credit facility covenants minimum fixed charge coverage ratio |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  | 1.20 |  |  |  |  |  |
Increased line of credit |  |  |  |  |  |  | 75,000,000 |  |  | 90,000,000 |  |  |  |  | 75,000,000 | 90,000,000 |  |  |  |
Long term borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |
Line of credit facility covenants maximum debt leverage ratio |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |  |  |  |
Line of credit, LIBOR |  |  |  |  |  |  |  |  |  |  | LIBOR plus 4.5% |  |  |  |  |  |  |  |  |
Revolving line of credit, scheduled maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 20, 2017 |  |  |
Outstanding borrowings under its revolving line of credit | 69,000,000 | 9,000,000 | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit bears interest at BMO Bank's LIBOR rate | 1.65% | 1.67% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining outstanding balance | 1,100,000 | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of applicable margin interest rate | 3.25% | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused and available line of credit balance | $ 19,400,000 | $ 47,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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