Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 38,679	$ 40,406
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	52,047	51,544
Accumulated amortization	(16,669)	(14,281)
Net intangible assets	35,378	37,263
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	4,012	3,933
Accumulated amortization	(711)	(790)
Net intangible assets	$ 3,301	$ 3,143