Equity Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Apr. 25, 2013	Dec. 31, 2013	Dec. 31, 2012
Stockholders Equity [Line Items]
Preferred stock authorized but unissued and undesignated		10,000	10,000
Additional amount authorized by Board of Directors	$ 25,000
Authorization amount for repurchase of common stock	75,000
Expiration date on repurchase authorizations		Sep. 30, 2014
Common stock acquired, shares		2,750
Aggregate cost shares of common stock		47,459
Since Approval of Share Repurchase Plan [Member]
Stockholders Equity [Line Items]
Common stock acquired, shares		340
Aggregate cost shares of common stock		8,323
Remaining authorized repurchase amount		$ 27,541