Cash Payments and Non-Cash Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Cash Flow, Supplemental [Line Items]
Cash paid for interest	$ 8	$ 28	$ 34
Cash paid for income taxes	$ 10,286	$ 5,256	$ 5,422