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Stock-Based Compensation - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended			9 Months Ended
	Sep. 30, 2014 Incentive_Plan	Dec. 31, 2013	Dec. 20, 2013 Equity Incentive Plan [Member]	Sep. 30, 2014 Equity Incentive Plan [Member]	Dec. 20, 2013 Equity Incentive Plan [Member]	Sep. 30, 2014 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2014 Options [Member]	Sep. 30, 2014 Options [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plans	3
Shares authorized	225,000,000	225,000,000		9,732,520
Annual increase in number of shares of common stock				4.00%
Aggregate limit of shares issuable to incentive stock option awards				3,000,000
Initial grant of stock-based compensation in shares					6,000,000
Increase in percentage of outstanding number of shares of common stock			4.00%
Total unrecognized compensation expense	$ 3,733,000
Vesting period	2 years 10 months 24 days
Percentage of vested grant yearly						25.00%	25.00%
Percentage of vested grant monthly						75.00%	75.00%
Term of years						10 years	4 years	10 years
Vesting period of grant date								3 years
Unexercised vested option forfeiture							3 months
Exercise price						$ 20.00
Number of SARs, Granted						0
Number of SARs, Exercised						0
Number of SARs, Forfeited and expired						0

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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.

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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.

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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.

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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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Net number of non-option equity instruments granted to participants.

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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.

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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.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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