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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 Incentive_Plan | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 20, 2013 Equity Incentive Plan [Member] | Dec. 31, 2013 Equity Incentive Plan [Member] | Dec. 31, 2013 Restricted Stock [Member] | Dec. 31, 2013 Restricted Stock Three [Member] | Dec. 31, 2013 Stock Appreciation Rights (SARs) [Member] | Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member] | Dec. 31, 2011 Stock Appreciation Rights (SARs) [Member] | Dec. 31, 2013 Options [Member] | Dec. 31, 2012 Options [Member] | Dec. 31, 2011 Options [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Maximum [Member] Restricted Stock [Member] | Dec. 31, 2013 Maximum [Member] Options [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2013 Minimum [Member] Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized | 225,000,000 | 225,000,000 |  |  | 8,553,608 |  |  |  |  |  |  |  |  | 225,000,000 |  |  | 75,000,000 |
Annual increase in number of shares of common stock |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate limit of shares issuable to incentive stock option awards |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity incentive plans | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial grant of stock-based compensation in shares |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in percentage of outstanding number of shares of common stock |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of years | 5 years 1 month 6 days | 6 years 4 months 24 days | 7 years 4 months 24 days |  |  |  |  |  |  |  | 4 years |  |  |  | 10 years | 10 years |  |
Vesting period of grant date |  |  |  |  |  | 1 year |  | 3 years |  |  |  |  |  |  | 3 years | 3 years |  | 1 year
Restricted stock units vest and convert into shares of our common stock |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Percentage of vested grant yearly |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Percentage of vested grant monthly |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Unexercised vested option forfeiture |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |
Total unrecognized compensation expense | $ 4,275,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value per share of options granted | $ 0.00 | $ 0.00 | $ 5.31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options at time of exercise | 2,214 | 4,319 | 11,293 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value |  |  |  |  |  |  |  |  |  |  | 406,000 | 627,000 | 1,545,000 |  |  |  |  |
Exercise price | $ 20.42 |  |  |  |  |  |  | $ 20.00 |  |  |  |  |  |  |  |  |  |
Reduced compensation expense |  |  |  |  |  |  |  | 11,000 |  | 344,000 |  |  |  |  |  |  |  |
Total compensation expense | $ 2,608,670 | $ 2,878,134 | $ 3,260,937 |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |

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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 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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- 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 of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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