Goodwill and Intangible Assets - Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 40,406	$ 42,313
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	51,544	51,603
Accumulated amortization	(14,281)	(11,717)
Net intangible assets	37,263	39,886
Weighted average useful life	13 years	13 years
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets	3,933	2,848
Accumulated amortization	(790)	(421)
Net intangible assets	$ 3,143	$ 2,427
Weighted average useful life	6 years	6 years