- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

+ References+ Details

Retirement Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan employer contribution description	The Company makes matching cash contributions subject to certain restrictions, structured as a 100% match on the first 1% contributed by the employee and a 50% match on the next 5% contributed by the employee.
Defined contribution plan, employer- matching contributions	$ 7,790	$ 8,956	$ 8,767
First 1% [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching percentage	100.00%
Percentage of gross pay matched	1.00%
Second 5% [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching percentage	50.00%
Percentage of gross pay matched	5.00%