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Borrowings - Remaining Maturities of Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Debt Instrument [Line Items]
Less than 1 year	$ 166,467
1 to 3 years	45,477
3 to 5 years
More than 5 years
Total	211,944
Wells Facility borrowings [Member]
Debt Instrument [Line Items]
Less than 1 year	166,467
1 to 3 years	45,474
3 to 5 years
More than 5 years
Total	211,941
JPMorgan Facility borrowings [Member]
Debt Instrument [Line Items]
1 to 3 years	3
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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