Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 8,757	$ 11,908
Accounts receivable, net of allowances of $2,403 and $1,476, respectively	170,792	122,947
Deferred income taxes	2,774	3,800
Prepaid expenses and other current assets	23,525	26,461
Total current assets	205,848	165,116
Property and equipment, net of accumulated depreciation of $29,141 and $20,108, respectively	96,234	68,576
Other assets:
Goodwill	515,862	442,143
Intangible assets, net	24,607	12,710
Other noncurrent assets	11,690	12,263
Total other assets	552,159	467,116
Total assets	854,241	700,808
Current liabilities:
Current maturities of long-term debt	9,844	17,000
Accounts payable	68,184	54,887
Accrued expenses and other liabilities	29,908	29,132
Total current liabilities	107,936	101,019
Long-term debt, net of current maturities	195,969	144,500
Other long-term liabilities	62,591	63,210
Total liabilities	366,496	308,729
Common stock $.01 par value; 100,000 shares authorized; 37,480 and 34,371 shares issued and outstanding	375	344
Additional paid-in capital	382,887	325,034
Retained earnings	104,483	66,701
Total stockholders’ investment	487,745	392,079
Total liabilities and stockholders’ investment	$ 854,241	$ 700,808