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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)			1 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Oct. 31, 2010 Non-compete agreement	Sep. 30, 2012 Non-compete agreement	Sep. 30, 2011 Non-compete agreement	Sep. 30, 2012 Non-compete agreement	Sep. 30, 2011 Non-compete agreement	Sep. 30, 2012 Customer relationships	Sep. 30, 2011 Customer relationships	Sep. 30, 2012 Customer relationships	Sep. 30, 2011 Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment loss	$ 0	$ 0
Contract term			3 years
Amortization period (in years)						3 years				7 years
Amortization expense				$ 117,000	$ 117,000	$ 350,000	$ 350,000	$ 911,000.0	$ 911,000.0	$ 2,700,000	$ 2,700,000

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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