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Goodwill and Intangibles - Additional Information (Detail) (Other intangible assets [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Other intangible assets [Member]
Goodwill And Other Intangible Asset [Line Items]
Amortization expense on other intangible assets	$ 204,000

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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