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401(k) Savings Plan - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) h	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Compensation and Retirement Disclosure [Abstract]
Age to participate in the savings plan	21 years
Time to participate in the savings plan | h	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	$ 1,158,000	$ 885,000	$ 734,000

X

- Definition

Age to participate in the savings plan.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

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+ Details

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X

- Definition

Defined contribution employee contribution percent.

+ References

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+ Details

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X

- Definition

Defined contribution plan employer matching contribution amount.

+ References

No definition available.

+ Details

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- Definition

Employee contribution portion of annual compensation.

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X

- Definition

Time to participate in the savings plan.

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No definition available.

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- References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

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

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No definition available.

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X

- Definition

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

+ References

No definition available.

+ Details

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