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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense related to intangible assets	$ 2,522	$ 2,537	$ 5,049	$ 5,463

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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