Goodwill And Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Segment	Jun. 30, 2011	Jun. 30, 2012 Segment	Jun. 30, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment test, number of reporting units	3		3
Amortization expense related to intangible assets	$ 928	$ 2,522	$ 1,667	$ 5,049