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Stock Compensation - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 14, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
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 |  | 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 |  | $ 0 |  | $ 0 |
Shares, granted |  | 0 | 0 | 0 | 0
Compensation expense restricted stock awards |  | $ 204,000 | $ 216,000 | $ 600,000 | $ 628,000
Fair value of shares vesting during period |  | 6,000 | $ 3,000 | 929,000 | $ 559,000
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to nonvested restricted stock |  | $ 1,578,000 |  | $ 1,578,000 |
Performance Based Restricted Stock Awards [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares, granted | 10,000 |  |  |  |
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 |
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 |

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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