Fair Values of Loans, Notes and Certificates (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans at fair value	$ 1,829,042	$ 781,215
Notes and Certificates at fair value	1,839,990	785,316
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans at fair value	1,829,042	781,215
Notes and Certificates at fair value	$ 1,839,990	$ 785,316