Acquisitions (Narrative) (Detail) (USD $)	1 Months Ended
	Jul. 22, 2011 D
Business Acquisition [Line Items]
Purchase price	$ 80,000,000
Accrued working capital adjustments	100,000
Number of days for working capital adjustment	60
Cash paid MWM Sellers on acquisition	72,000,000
Remainder of Fixed Purchase Price payable in future	8,000,000
Acquisition earn-out contingent payable	57,000,000
Financial targets achievement period end	June 30, 2014
Preliminary valuation of contingent consideration	22,100,000
Goodwill recognized	79,757,000
Approximate goodwill amount deductible for tax purposes	35,600,000
Acquired intangible assets	20,600,000
Acquisition costs incurred	900,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	19,200,000
Approximate useful life	10 years
Technology [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 1,400,000
Approximate useful life	4 years