Subsequent Event - Additional Information (Detail) (USD $)			6 Months Ended	0 Months Ended		0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Sterner Insurance Associates Inc [Member]	Jul. 01, 2014 Sterner Insurance Associates Inc [Member] Subsequent Event [Member]	Jul. 01, 2014 Sterner Insurance Associates Inc [Member] Subsequent Event [Member]	Jul. 01, 2014 Sterner Insurance Associates Inc [Member] Subsequent Event [Member] Customer Related Intangible Assets [Member]
Subsequent Event [Line Items]
Acquisition completion date			Jul. 01, 2014
Cash paid for acquisition				$ 3,900,000
Fair value of contingent consideration liability					940,000
Potential cash payments from contingent consideration, period of measurement (in years)				3 years
Potential cash payments from contingent consideration, end date			Jun. 30, 2017
Original potential cash payments from contingent consideration, minimum					0
Original potential cash payments from contingent consideration, maximum					5,700,000
Fair value of contingent consideration liabilities					635,000
Goodwill	64,326,000	57,517,000			3,400,000
Intangibles						$ 1,600,000
Amortization period						9 years