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Summary of Option Activity (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Incentive Stock Option Plans, Beginning balance | 724,904 | 561,029 | 705,345
Incentive Stock Option Plans, Options granted |  | 277,025 |
Weighted Average Price Per Share, Options granted |  | $ 11.49 |
Incentive Stock Option Plans, Options exercised | (63,950) | (113,150) | (126,149)
Incentive Stock Option Plans, Option forfeited | (34,109) |  | (18,167)
Incentive Stock Option Plans, Ending balance | 626,845 | 724,904 | 561,029
Weighted Average Price Per Share, Beginning balance | $ 9.22 | $ 7.76 | $ 7.70
Weighted Average Price Per Share, Options exercised | 7.50 | 7.50 | 7.50
Weighted Average Price Per Share, Option forfeited | 12.00 |  | 7.50
Weighted Average Price Per Share, Ending balance | 9.25 | 9.22 | 7.76
Exercisable Weighted Average Price Per Share, Beginning balance | 7.82 | 7.70 | 7.95
Exercisable Weighted Average Price Per Share, Ending balance | $ 7.73 | $ 7.82 | $ 7.70
Performance Based Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Incentive Stock Option Plans, Beginning balance | 107,689 |  |
Incentive Stock Option Plans, Option forfeited | (9,279) |  |
Incentive Stock Option Plans, Ending balance | 98,410 | 107,689 |
Weighted Average Price Per Share, Beginning balance | $ 11.49 |  |
Weighted Average Price Per Share, Option forfeited | 11.49 |  |
Weighted Average Price Per Share, Ending balance | $ 11.49 | $ 11.49 |

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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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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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