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Stock-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 Incentive_Plan | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 75,000,000 | 75,000,000 | 75,000,000
Equity Incentive Plans |  | 2 |
Total unrecognized compensation expense | $ 4,767,000 | $ 4,767,000 |
Vesting period |  | 3 years 2 months 12 days |
Vesting period of grant date | 1 year |  |
Exercise price | $ 20.00 | $ 20.00 |
Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 2,601,389 | 2,601,389 |
Annual increase in number of shares of common stock | 4.00% | 4.00% |
Aggregate limit of shares issuable to incentive stock option awards | 3,000,000 | 3,000,000 |
Stock Appreciation Rights (SARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period of grant date |  | 3 years |
Percentage of vested grant yearly |  | 25.00% |
Percentage of vested grant monthly |  | 75.00% |
Stock Appreciation Rights (SARs) [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term of years |  | 10 years |
Restricted Stock Three [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units vest and convert into shares of our common stock |  | 4 years |
Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term of years |  | 4 years |
Percentage of vested grant yearly |  | 25.00% |
Percentage of vested grant monthly |  | 75.00% |
Unexercised vested option forfeiture |  | 3 months |
Estimated fair value | $ 87,000 |  |
Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term of years |  | 10 years |
Vesting period of grant date |  | 3 years |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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