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Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Selling & administrative	$ 9,608,000	$ 7,935,000
Operating income (loss)	15,724,000	9,708,000
Directors and Officers Liability Insurance \| Minimum
Commitments and Contingencies Disclosure [Line Items]
Expenses that are subject to insurance reimbursement, collection period	90
Directors and Officers Liability Insurance \| Maximum
Commitments and Contingencies Disclosure [Line Items]
Expenses that are subject to insurance reimbursement, collection period	120
Legal Fees and Other Third Party Costs
Commitments and Contingencies Disclosure [Line Items]
Selling & administrative	1,800,000	800,000
Legal Fees and Other Third Party Costs \| Directors and Officers Liability Insurance
Commitments and Contingencies Disclosure [Line Items]
Reimbursement from insurance carrier	1,400,000	700,000
Operating income (loss)	$ 400,000	$ 100,000

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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