Goodwill and Other Intangible Assets - Carrying Amount of Amortizable Intangible Assets and Related Accumulated Amortization (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	10 years 2 months 12 days
Gross Carrying Amount	$ 40,991	$ 40,774
Accumulated Amortization	16,984	14,137
Net Carrying Amount	24,007	26,637
Client relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	8 years 8 months 12 days
Gross Carrying Amount	23,699	23,541
Accumulated Amortization	13,556	11,834
Net Carrying Amount	10,143	11,707
Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	15 years
Gross Carrying Amount	9,484	9,430
Accumulated Amortization	(1,814)	(1,223)
Net Carrying Amount	7,670	8,207
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	7 years
Gross Carrying Amount	7,200	7,200
Accumulated Amortization	(1,543)	(1,029)
Net Carrying Amount	5,657	6,171
Non-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	5 years
Gross Carrying Amount	608	603
Accumulated Amortization	(71)	(51)
Net Carrying Amount	$ 537	$ 552