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Reconciliation of Changes in Allowance for Loans Receivable Current (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of year	$ 5,057	$ 5,057	$ 3,574
Additions: Provision for bad debt expenses	169	1,820	1,639
Less: Writes-offs	(1,620)
Balance at end of year	3,437	5,057	5,057
Allowance for Loan and Lease Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions: Provision for bad debt expenses			$ 1,483

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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- Definition

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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