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Summary of Stock Options Summarized by Exercise Price (Detail) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Weighted Average, Exercise Price | $ 9.25 | $ 9.22 | $ 7.76 | $ 7.70
Exercisable Weighted Average, Exercise Price | $ 7.73 | $ 7.82 | $ 7.70 | $ 7.95
Incentive Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Weighted Average, Shares | 626,845 |  |  |
Outstanding Weighted Average, Remaining Life (Months) | 79 months | 90 months |  |
Outstanding Weighted Average, Exercise Price | $ 9.25 | $ 9.22 |  |
Exercisable Weighted Average, Shares | 373,929 | 447,879 |  |
Exercisable Weighted Average, Exercise Price | $ 7.73 | $ 7.82 |  |
Incentive Stock Option Plan | Range One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Price Per Share, Lower Range | $ 7.50 |  |  |
Outstanding Weighted Average, Shares | 357,250 |  |  |
Outstanding Weighted Average, Remaining Life (Months) | 59 months |  |  |
Outstanding Weighted Average, Exercise Price | $ 7.50 |  |  |
Exercisable Weighted Average, Shares | 357,250 |  |  |
Exercisable Weighted Average, Exercise Price | $ 7.50 |  |  |
Incentive Stock Option Plan | Range Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Price Per Share, Lower Range | 11.32 |  |  |
Exercise Price Per Share, Upper Range | $ 14.75 |  |  |
Outstanding Weighted Average, Shares | 269,595 |  |  |
Outstanding Weighted Average, Remaining Life (Months) | 104 months |  |  |
Outstanding Weighted Average, Exercise Price | $ 11.56 |  |  |
Exercisable Weighted Average, Shares | 16,679 |  |  |
Exercisable Weighted Average, Exercise Price | $ 12.69 |  |  |
Performance Based Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding Weighted Average, Shares |  | 98,410 |  |
Outstanding Weighted Average, Remaining Life (Months) | 24 months | 36 months |  |
Outstanding Weighted Average, Exercise Price | $ 11.49 | $ 11.49 |  |
Performance Based Options | Range Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Price Per Share, Lower Range |  | $ 11.49 |  |
Outstanding Weighted Average, Shares |  | 98,410 |  |
Outstanding Weighted Average, Remaining Life (Months) |  | 24 months |  |
Outstanding Weighted Average, Exercise Price |  | $ 11.49 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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