Senior and Subordinated Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended							0 Months Ended	12 Months Ended	0 Months Ended
	Jul. 22, 2011	Dec. 31, 2013	Dec. 31, 2012	Sep. 25, 2012	Dec. 31, 2013 Unused lines of Credit [Member]	Dec. 31, 2013 LFB [Member] Unused lines of Credit [Member]	Dec. 31, 2013 Edgewater [Member] Unused lines of Credit [Member]	Sep. 25, 2012 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Jul. 22, 2011 Subordinated Debt [Member]
Debt Instrument [Line Items]
Senior revolving credit facility over next 3 years				$ 150,000
Expiration date of credit facility								Sep. 25, 2015
Duration of senior revolving credit facility, in years				3 years
Revolving credit facility annual interest rate									0.79%
Outstanding credit facility		0	0		258,000	48,000	55,000
Promissory note representing subordinated debt, repurchased	150,000
Subordinated promissory note, at cost	131,829
Pre-tax gain resulted from repurchasing of subordinated note										$ 18,171