Goodwill And Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Segment	Mar. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment test, number of reporting units	3
Amortization expense related to intangible assets	$ 739	$ 2,527
Trade Name
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets, useful life (years)	5
Customer Relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets, useful life (years)	4