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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands | 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] |  |  |  |
Number of Shares, Outstanding | 626,845 | 724,904 | 561,029 | 705,345
Weighted Average Exercise Price, Outstanding | $ 9.25 | $ 9.22 | $ 7.76 | $ 7.70
Weighted Average Exercisable, 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] |  |  |  |
Number of Shares, Outstanding | 626,845 | 724,904 |  |
Number of Shares, Expected to Vest | 616,987 | 713,172 |  |
Number of Shares, Exercisable | 373,929 | 447,879 |  |
Weighted Average Exercise Price, Outstanding | $ 9.25 | $ 9.22 |  |
Weighted Average Exercise Price, Expected to Vest | 9.21 | 9.19 |  |
Weighted Average Exercisable, Exercise Price | $ 7.73 | $ 7.82 |  |
Weighted Average Remaining Life, Outstanding | 79 months | 90 months |  |
Weighted Average Remaining Contractual Life, Expected to Vest | 78 months | 89 months |  |
Weighted Average Remaining Contractual Life, Exercisable | 59 months | 71 months |  |
Intrinsic Value, Outstanding | $ 2,990 | $ 1,774 |  |
Intrinsic Value, Expected to Vest | 2,965 | 1,773 |  |
Intrinsic Value, Exercisable | $ 2,353 | $ 1,738 |  |
Performance Based Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares, Outstanding | 98,410 | 107,689 |  |
Number of Shares, Expected to Vest | 58,410 | 107,689 |  |
Weighted Average Exercise Price, Outstanding | $ 11.49 | $ 11.49 |  |
Weighted Average Exercise Price, Expected to Vest | $ 11.49 | $ 11.49 |  |
Weighted Average Remaining Life, Outstanding | 24 months | 36 months |  |
Weighted Average Remaining Contractual Life, Expected to Vest | 24 months | 36 months |  |
Weighted Average Remaining Contractual Life, Exercisable | 0 months | 0 months |  |
Intrinsic Value, Outstanding | $ 248 | $ 14 |  |
Intrinsic Value, Expected to Vest | $ 147 | $ 14 |  |

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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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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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