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Equity Based Plans - Summary of Stock Options Outstanding (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding stock options | 38,700 | 75,840 | 348,810 | 723,890
Outstanding Stock Options, Exercise price Lower Limit | $ 12.60 | $ 12.51 | $ 12.51 |
Outstanding Stock Options, Exercise price Upper Limit | $ 18.42 | $ 18.80 | $ 18.80 |
Exercisable, Exercise price Lower Limit | $ 12.60 | $ 12.51 | $ 12.51 |
Exercisable, Exercise price Upper Limit | $ 18.42 | $ 18.80 | $ 18.80 |
Weighted Average Remaining Contractual Life | 1 year 7 months 6 days | 2 years 2 months 12 days | 2 years 7 months 6 days | 3 years 7 months 6 days
Exercisable | 38,700 | 75,840 | 348,810 |
1999 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding stock options | 8,700 | 15,840 | 17,310 |
Outstanding Stock Options, Exercise price Lower Limit | $ 12.60 | $ 12.60 | $ 12.60 |
Outstanding Stock Options, Exercise price Upper Limit | $ 18.42 | $ 18.42 | $ 18.42 |
Exercisable, Exercise price Lower Limit | $ 12.60 | $ 12.60 | $ 12.60 |
Exercisable, Exercise price Upper Limit | $ 18.42 | $ 18.42 | $ 18.42 |
Weighted Average Remaining Contractual Life | 1 year 7 months 6 days | 2 years 2 months 12 days | 3 years 2 months 12 days |
Exercisable | 8,700 | 15,840 | 17,310 |
2003 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding stock options | 30,000 | 60,000 | 251,500 |
Outstanding Stock Options, Exercise price Lower Limit |  | $ 12.51 | $ 12.51 |
Outstanding Stock Options, Exercise price Upper Limit | $ 18.42 | $ 18.80 | $ 18.80 |
Exercisable, Exercise price Lower Limit |  | $ 12.51 | $ 12.51 |
Exercisable, Exercise price Upper Limit | $ 18.42 | $ 18.80 | $ 18.80 |
Weighted Average Remaining Contractual Life | 1 year 7 months 6 days | 2 years 2 months 12 days | 2 years 10 months 24 days |
Exercisable | 30,000 | 60,000 | 251,500 |
Inducements [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding stock options |  |  | 80,000 |
Outstanding Stock Options, Exercise price Lower Limit |  |  | $ 12.75 |
Outstanding Stock Options, Exercise price Upper Limit |  |  | $ 14.32 |
Exercisable, Exercise price Lower Limit |  |  | $ 12.75 |
Exercisable, Exercise price Upper Limit |  |  | $ 14.32 |
Weighted Average Remaining Contractual Life |  |  | 1 year 8 months 12 days |
Exercisable |  |  | 80,000 |

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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 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 Weighted average remaining contractual term for option awards outstanding, 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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