401(k) Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Company's contribution to the plan, percentage	50.00%
Company's contribution to the plan, amount	$ 700,000	$ 800,000	$ 700,000
Company's matching contributions vesting annually	25.00%
Company's matching contributions vesting after four consecutive years of service	100.00%
Vesting period identified for vesting purpose	4 years
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Annual contribution by employer	$ 2,000