Summary of Significant Accounting Policies - Carrying Value and Classification of Related Assets and Maximum Exposure to Loss (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Loans, net [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	$ 268,881
Mortgage and other loans [Member]
Variable Interest Entity [Line Items]
Carrying Amount	210,523
Other assets [Member]
Variable Interest Entity [Line Items]
Carrying Amount	5,040
Equity investments [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	$ 18,827