Sale of Merchant Card Servicing Business - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 4,750,000
Gain on sale of business		3,093,000
Merchant Card Servicing Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	4,800,000
Termination fee	1,700,000
Gain on sale of business	$ 3,100,000
Initial term of agreement		10 years