Savings Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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%
401(k) Plan, employer matching percentage for the second 2% of participants' contribution	50.00%
Maximum potential employer match for 401(k) Plan	4.00%
Vested percentage for amounts contributed by the Company, after five years of employment	100.00%
Company's contribution to the 401(k) Plan	$ 1.3	$ 1.3	$ 1.1