Savings Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Savings Plan, 401(k) Disclosure [Line Items]
Employees eligible compensation deferral for 401(k) Plan	60.00%
401(k) Plan, employer matching percentage for the first 3% of participants' contribution	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
401(k) Plan, employer matching percentage for the second 2% of participants' contribution	50.00%
Employer 401K, Employee Contribution matched 50 percent by Employer	2.00%
Employer 401 K Matching Contribution To Employee Maximum	4.00%
Vested percentage for amounts contributed by the Company, after five years of employment	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 1.3	$ 1.3	$ 1.3

Deferred Compensation Arrangement with Individual, Contributions by Plan Participants, Percentage of Salary, Maximum

No definition available.

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Deferred Compensation Arrangement with Individual, Percentage Vested

No definition available.

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Employer matching contribution of fifty percent of the employee contribution.

No definition available.

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Additional level of matching contribution by employer for employee retirement plan.

No definition available.

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The maximum matching contribution by employer for employee retirement plan.

No definition available.

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Employer matching contribution of one hundred percent of the employee contribution.

No definition available.

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Data Type:	num:percentItemType
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Initial matching contribution by employer for employee retirement plan.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

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