Reverse Mortgage and Related Assets - Summary of Estimated Cash Payments to Reverse Mortgagors (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Mortgage Banking [Abstract]
Remaining in 2014	$ 650
2015	739
2016	589
2017	465
2018	363
Years 2019 - 2023	869
Years 2024 - 2028	190
Years 2029 - 2033	32
Thereafter	4
Total	$ 3,901