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2012 Incentive Compensation Plan - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended |
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Jun. 06, 2012 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Minimum [Member] | Jun. 30, 2014 Maximum [Member] | Jun. 30, 2014 Employee Stock Option 2012 [Member] | Jun. 30, 2014 Stock Compensation Plan [Member] | Jul. 31, 2013 Stock Compensation Plan [Member] | Jun. 30, 2014 Stock Compensation Plan [Member] 2012 Plan [Member] | Jun. 30, 2014 SAR [Member] | Jun. 06, 2012 SAR [Member] Chief Operating Officer [Member] | Jun. 30, 2014 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2014 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2014 Restricted Stock [Member] Maximum [Member] | Jun. 30, 2014 Restricted Stock [Member] 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased by the company, shares |  | 830,925 |  | 830,925 |  | 830,925 |  |  |  | 830,925 |  |  |  |  |  |  |  |  |  |
Common stock available for issuance |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |
Share authorized for stock based compensation |  |  |  |  |  |  |  |  |  |  |  | 1,530,925 |  |  |  |  |  |  |  |
Number of shares granted to employees |  |  |  |  |  |  |  |  |  |  |  |  |  | 543,872 |  |  | 174,993 |  |  |
Common stock available for further issuance |  |  |  |  |  |  |  |  |  |  |  | 812,060 |  |  |  |  |  |  |  |
Number of shares granted under SAR Award Agreement | 543,872 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, market value per share |  | $ 22.07 |  | $ 22.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation dates of common stock under SAR award agreement, description |  |  |  | Commenced after the SAR Grant Date and prior to the expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SAR award expiration period from grant date |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate | 0.92% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anticipated volatility factor and zero dividend yield | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount on valuation of trading activity |  | 15.00% |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of SAR granted |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.31 |  |  |  | $ 76.93 |  |  |
Service period |  |  |  | 1 year 9 months 11 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term to exceed public equivalent value over aggregate exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses for the SAR granted |  | 105,000 | 450,000 | 228,000 | 657,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation expense |  | 187,000 |  | 187,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,376,000
Total expected expense |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected period of recognition of cost |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  | 0 years |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 435,000 | $ 18,000 | $ 237,000 | $ 18,000 |  |
Restricted stock agreement vesting |  |  |  |  |  |  |  |  | These shares of Restricted Stock vest in various increments and periods over a maximum of ten years from the date the stock was granted as defined under the applicable Restricted Stock Award Agreement. |  |  |  |  |  |  |  |  |  |  |
Vesting period for restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |

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