CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 6,155	$ 3,674
Adjustments to reconcile net income to cash (used in) provided by operating activities:
Depreciation and amortization	6,645	5,001
Amortization of discount and deferred debt issuance costs	675	888
Share-based compensation	1,174
Deferred income taxes, net	1,100	1,773
Provision for losses on accounts receivable	1,549	1,694
Loss on sale of assets	35	23
Changes in operating assets and liabilities	(19,854)	9,382
Cash (used in) provided by operating activities	(2,521)	22,435
Cash flows from investing activities:
Purchases of property and equipment	(4,261)	(2,081)
Acquisitions of businesses, net of cash acquired	(4,550)	(6,109)
Proceeds from sale of assets	10
Cash used in investing activities	(8,801)	(8,190)
Cash flows from financing activities:
Long-term debt repayments	(1,188)	(31,493)
Long-term debt borrowings	71
Short-term borrowings-three months or less, net		7,000
Payments on obligations under capital lease	(23)	(23)
Funds contributed by co-investors		1,400
Debt issuance costs		(129)
Cash used in financing activities	(1,140)	(23,245)
Effect of exchange rate changes on cash and cash equivalents	64	90
Decrease in cash and cash equivalents	(12,398)	(8,910)
Cash and cash equivalents at beginning of period	25,651	27,552
Cash and cash equivalents at end of period	13,253	18,642
Supplemental schedule of non-cash investing and financing activities:
Notes issued in connection with acquisitions		$ 665