Subsequent Event (Narrative) (Details) (USD $)	12 Months Ended				12 Months Ended					12 Months Ended			0 Months Ended	12 Months Ended				0 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Jan. 09, 2012 Arrowhead [Member]	Dec. 31, 2011 Arrowhead [Member]	Dec. 31, 2011 Purchased Customer Accounts [Member] Arrowhead [Member] years	Dec. 31, 2011 Non-Compete Agreements [Member] Arrowhead [Member] years	Jan. 09, 2012 Promissory Note [Member] Arrowhead [Member]	Jan. 09, 2012 SunTrust Term Loan [Member] Arrowhead [Member]	Jan. 09, 2012 SunTrust Term Loan [Member] Term Loan [Member] Arrowhead [Member]	Dec. 31, 2011 SunTrust Revolver [Member] Arrowhead [Member]	Jan. 09, 2012 SunTrust Revolver [Member] Arrowhead [Member]	Jan. 09, 2012 SunTrust Revolver [Member] Revolving Line Of Credit [Member] Arrowhead [Member]	Jan. 09, 2012 SunTrust Agreement [Member] Arrowhead [Member]	Dec. 31, 2011 JPM Bridge Facility [Member] Arrowhead [Member]	Jan. 09, 2012 JPM Bridge Facility [Member] Bridge Facility [Member] Arrowhead [Member]	Feb. 26, 2012 JPM Term Loan [Member] Arrowhead [Member]	Jan. 26, 2012 JPM Term Loan [Member] Arrowhead [Member]	Jan. 09, 2012 Minimum [Member] SunTrust Agreement [Member] Arrowhead [Member]	Jan. 09, 2012 Maximum [Member] SunTrust Agreement [Member] Arrowhead [Member]	Jan. 09, 2012 LIBOR [Member] Minimum [Member] SunTrust Agreement [Member] Arrowhead [Member]	Jan. 09, 2012 LIBOR [Member] Maximum [Member] SunTrust Agreement [Member] Arrowhead [Member]	Jan. 09, 2012 Base Rate [Member] SunTrust Agreement [Member] Arrowhead [Member]	Dec. 31, 2011 Retail [Member]	Dec. 31, 2010 Retail [Member]	Dec. 31, 2011 National Programs [Member]	Dec. 31, 2010 National Programs [Member]	Dec. 31, 2011 Services [Member]	Dec. 31, 2010 Services [Member]
Subsequent Event [Line Items]
Aggregate purchase price of acquisitions	$ 214,822,000	$ 186,783,000	$ 580,767,000
Cash payments for acquisitions	167,444,000	158,636,000	397,531,000	397,531,000
Notes payable issued
Assumption of liabilities	15,659,000	2,298,000	178,904,000
Recorded earn-out payables	30,525,000	25,090,000	4,332,000	4,332,000
Weighted average useful lives of acquired amortizable intangible (years)					15.0	5.0
Goodwill acquired	132,534,000	120,430,000																					112,610,000	60,518,000	11,853,000		8,071,000	58,970,000
Goodwill acquired, deductible for income tax	84,105,000	91,303,000
Goodwill not-deductible for income tax purposes	13,714,000
Recorded earn-out payable	30,525,000	25,090,000
Line of credit							50,000,000		100,000,000			50,000,000			50,000,000		100,000,000
Debt instrument, maturity date										Dec. 31, 2016				Feb. 03, 2012
Increase in additional borrowings													50,000,000
Maximum borrowing capacity								$ 150,000,000			$ 100,000,000
Interest rate basis spread																1.00%				1.00%	1.40%	1.00%
Availability fee																		0.175%	0.25%
Letter of credit margin fee																		1.00%	1.40%