Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 12,666	$ 5,438
Accounts receivable, net of allowances of $3,859 and $2,957, respectively	296,130	171,165
Deferred income taxes	2,332	1,847
Prepaid expenses and other current assets	44,775	35,010
Total current assets	355,903	213,460
Property and equipment, net of accumulated depreciation of $42,721 and $30,869, respectively	141,670	96,558
Other assets:
Goodwill	668,129	518,743
Intangible assets, net	67,131	31,363
Other noncurrent assets	14,568	11,756
Total other assets	749,828	561,862
Total assets	1,247,401	871,880
Current liabilities:
Current maturities of long-term debt	10,000	10,938
Accounts payable	127,110	67,141
Accrued expenses and other liabilities	48,108	33,271
Total current liabilities	185,218	111,350
Long-term debt, net of current maturities	433,581	181,702
Other long-term liabilities	82,735	78,463
Total liabilities	701,534	371,515
Common stock $.01 par value; 100,000 shares authorized; 37,925 and 37,564 shares issued and outstanding	379	376
Additional paid-in capital	390,196	384,292
Retained earnings	155,292	115,697
Total stockholders’ investment	545,867	500,365
Total liabilities and stockholders’ investment	$ 1,247,401	$ 871,880