Disclosures about Fair Value of Financial Instruments - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Jun. 26, 2014	Aug. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, average life from purchase to sale (days)	19 days
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior unsecured notes aggregate amount		$ 25,000,000.0
Senior Notes Due 2018 | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior unsecured notes term (years)	5 years
Senior unsecured notes aggregate amount			$ 63,300,000.0