Summary Of Significant Accounting Policies (Accumulated Amortization Of Other Intangibles) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Client relationships	$ 32,959	$ 18,859
Software development costs	32,935	29,327
Other	5,672	3,065
Total other intangibles	71,566	51,251
Client relationships accumulated amortization	(23,743)	(16,629)
Total other intangibles - net	47,823	34,622
Client Relationships Accumulated Amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Client relationships accumulated amortization	(6,871)	(3,623)
Software Development Costs Accumulated Amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Client relationships accumulated amortization	(15,392)	(12,016)
Other Accumulated Amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Client relationships accumulated amortization	$ (1,480)	$ (990)