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Goodwill And Other Intangible Assets (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Goodwill [Line Items]
Amortization of intangible assets	$ 1,384	$ 1,397	$ 4,178	$ 4,191
Maximum [Member]
Goodwill [Line Items]
wbs_DiscountedRatesOnProjectedFutureCashFlows			17.30%
Long-term growth rate used in determining the terminal value.			7.00%
Minimum [Member]
Goodwill [Line Items]
wbs_DiscountedRatesOnProjectedFutureCashFlows			12.90%
Long-term growth rate used in determining the terminal value.			4.00%

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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