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401(k) Savings Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Age Hours	Dec. 31, 2012	Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]
Age to participate in the savings plan	21
Time to participate in the savings plan	1,000
Consecutive period to participate in the savings plan	12 months
Discretionary Company contributions	$ 0	$ 0	$ 0
Contributions by management	100.00%
Percentage of each participating employee annual compensation	3.00%
Employee's contributions	50.00%
Additional annual compensation	2.00%
Matching contributions	$ 734,000	$ 610,000	$ 494,000

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- Definition

Age to participate in the savings plan.

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- Definition

Consecutive period of service following initial date of employment for saving plan valuation.

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- Definition

Defined contribution employee contribution percent.

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- Definition

Defined contribution plan employer matching contribution amount.

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- Definition

Employee contribution portion of annual compensation.

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- Definition

Time to participate in the savings plan.

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- Definition

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

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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