Supplemental Guarantor Condensed Consolidating Financials - Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net cash and cash equivalents provided by operating activities	$ 19,131	$ 15,397
Investing activities:
Cash paid for acquisitions, net of cash acquired	0	(142,064)
Purchases of property and equipment	(8,660)	(8,953)
Purchase of investment	0	(1,852)
Net cash and cash equivalents used in investing activities	(8,660)	(152,869)
Financing activities:
Repayment of borrowings	(46,800)	(16,100)
Borrowings under debt facilities	15,000	110,000
Proceeds received from capital contribution	7,004	0
Debt issuance costs in connection with borrowings	0	(5,538)
Net cash and cash equivalents (used in) provided by financing activities	(24,796)	88,362
Effect of exchange rate changes on cash	(126)	(1,034)
Net decrease in cash and cash equivalents	(14,451)	(50,144)
Cash and cash equivalents:
Beginning of period	26,694	80,838
End of period	12,243	30,694
Issuer / Guarantor Subsidiaries
Operating activities:
Net cash and cash equivalents provided by operating activities	28,480	47,758
Investing activities:
Cash paid for acquisitions, net of cash acquired		(135,163)
Purchases of property and equipment	(7,024)	(7,981)
Purchase of investment		0
Net cash and cash equivalents used in investing activities	(7,024)	(143,144)
Financing activities:
Repayment of borrowings	(46,800)	(16,100)
Borrowings under debt facilities	15,000	110,000
Proceeds received from capital contribution	7,004
Debt issuance costs in connection with borrowings		(5,538)
Net cash and cash equivalents (used in) provided by financing activities	(24,796)	88,362
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	(3,340)	(7,024)
Cash and cash equivalents:
Beginning of period	3,764	11,093
End of period	424	4,069
Non-guarantor Subsidiaries
Operating activities:
Net cash and cash equivalents provided by operating activities	(9,349)	(32,361)
Investing activities:
Cash paid for acquisitions, net of cash acquired		(6,901)
Purchases of property and equipment	(1,636)	(972)
Purchase of investment		(1,852)
Net cash and cash equivalents used in investing activities	(1,636)	(9,725)
Financing activities:
Repayment of borrowings	0	0
Borrowings under debt facilities		0
Debt issuance costs in connection with borrowings
Net cash and cash equivalents (used in) provided by financing activities	0	0
Effect of exchange rate changes on cash	(126)	(1,034)
Net decrease in cash and cash equivalents	(11,111)	(43,120)
Cash and cash equivalents:
Beginning of period	22,930	69,745
End of period	11,819	26,625
Eliminations
Operating activities:
Net cash and cash equivalents provided by operating activities	0	0
Investing activities:
Cash paid for acquisitions, net of cash acquired		0
Purchases of property and equipment	0	0
Purchase of investment		0
Net cash and cash equivalents used in investing activities	0	0
Financing activities:
Repayment of borrowings	0	0
Borrowings under debt facilities		0
Debt issuance costs in connection with borrowings
Net cash and cash equivalents (used in) provided by financing activities	0	0
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	0	0
Cash and cash equivalents:
Beginning of period	0	0
End of period	$ 0	$ 0