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Stock Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of nonqualified options or restricted stock for key employees and independent director | 500,000 |
Description of award terms | For key employees, the plan vesting is one-fourth of the granted options or restricted stock per year beginning one year after the grant date, with 100% vested on the fourth anniversary of the grant date. For independent directors, the vesting schedule is one-third of the granted options or restricted stock per year beginning one year after the grant date, with 100% vested on the third anniversary of the grant date. |
Unrecognized compensation cost related to nonvested stock options granted under this plan | $ 0 |
Stock options, granted | 0 | 0
Compensation expense restricted stock awards | $ 240,000 | $ 157,000
Key Employees [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Starting period of vesting of stock based award | 1 year |
Aggregate percentage of stock based awards to be matured | 100.00% |
Stock incentive plan, vesting per year | 25.00% |
Award vesting period | 4 years |
Independent Directors [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Starting period of vesting of stock based award | 1 year |
Aggregate percentage of stock based awards to be matured | 100.00% |
Stock incentive plan, vesting per year | 33.33% |
Award vesting period | 3 years |
Restricted Stock Units (RSUs) [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 1,600,000 |

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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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