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Remaining Maturities of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Debt Instrument [Line Items]
Less than 1 year	$ 179,071
1 to 3 years	46,087
3 to 5 years
More than 5 years
Total	225,158
Wells Facility borrowings [Member]
Debt Instrument [Line Items]
Less than 1 year	179,068
1 to 3 years	46,087
3 to 5 years
More than 5 years
Total	225,155
JPMorgan Facility borrowings [Member]
Debt Instrument [Line Items]
Less than 1 year	3
1 to 3 years
3 to 5 years
More than 5 years
Total	$ 3

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth and fifth fiscal year following the latest fiscal year.

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