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Stock-Based Compensation (Detail) (USD $) Share data in Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Percentage of shares that may be issued or reserve for awards to participants as a percentage of outstanding shares calculated on a diluted basis | 12.50% |
Number of shares available for grant | 637 |
Unrecognized compensation cost | $ 3,196,000 |
Share-based compensation expense | 424,000 | 329,000
Stock Options [Member] |  |
Award vesting period | 10 years |
Award service period (in years) | 4 years |
Stock Options [Member] | Second Anniversary of Award Date [Member] |  |
Percent of options vesting | 50.00% |
Stock Options [Member] | Third Anniversary of Award Date [Member] |  |
Percent of options vesting | 25.00% |
Stock Options [Member] | Fourth Anniversary of Award Date [Member] |  |
Percent of options vesting | 25.00% |
Non-Vested Stock Options [Member] |  |
Unrecognized compensation cost | 13 |
Restricted Stock Units (RSUs) [Member] |  |
Unrecognized compensation cost | $ 3,183 |
Award vesting period | 3 years |
Unrecognized compensation cost, period of recognition | 2 years 2 months 9 days |
Restricted Stock Units (RSUs) [Member] | Second Anniversary of Award Date [Member] |  |
Peer company review period (in years) | 2 years |
Percentage of restricted stock units vesting | 67.00% |
Restricted Stock Units (RSUs) [Member] | Third Anniversary of Award Date [Member] |  |
Percentage of restricted stock units vesting | 33.00% |
Restricted Stock Units TSR [Member] | Second Anniversary of Award Date [Member] |  |
Peer company review period (in years) | 2 years |
Percentage of restricted stock units vesting | 67.00% |
Restricted Stock Units TSR [Member] | Third Anniversary of Award Date [Member] |  |
Percentage of restricted stock units vesting | 33.00% |

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- Definition Number of Shares that may be Issued or Reserve for Awards to Participants as a Percentage of Outstanding Shares Calculated on a Diluted Basis + References No definition available. + Details
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- Definition Percentage of restricted stock units vesting. + References No definition available. + Details
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- Definition Stock options granted to employees under the Incentive Plan have a 10-year life and they vest as follows: 50% after the second anniversary of the award date, 25% after the third anniversary, and the final 25% after the fourth anniversary of the award date. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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