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Equity Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			16 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Jul. 28, 2011
Stockholders Equity [Line Items]
Preferred stock authorized but unissued and undesignated	10,000	10,000		10,000
Additional amount authorized by board of directors					$ 25,000
Authorized to repurchase common stock including additional repurchase					50,000
Authorized to repurchase common stock	25,000
Expiration date on repurchase authorizations	Sep. 30, 2013			Sep. 30, 2013
Common stock acquired, shares	752			2,410
Aggregate cost shares of common stock	15,242	23,112	782	39,136
Remaining authorized repurchase amount	$ 10,864

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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