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Investments - Portfolio of Asset-Backed Loans and Other Invested Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Asset-backed loans, by major industry:
Total asset-backed loans	$ 181,414
Allowance for credit losses	1,360
Total asset-backed loans, net	180,054
Wholesale [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	77,217
Apparel [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	70,073
Jewelry [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	27,829
Other [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	$ 6,295