Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors (Details 3) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	Nov. 21, 2012	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations		$ 105,735	$ 79,059
Cash Flows from Operating Activities-Discontinued Operations		870	(4,175)
Cash Flows from Operating Activities		106,605	74,884
Cash Flows from Investing Activities:
Capital expenditures		(95,418)	(55,916)
Cash paid for acquisitions, net of cash acquired		74	(8,818)
Investment in restricted cash		(1)	(2)
Additions to customer relationship and acquisition costs		(4,636)	(3,008)
Proceeds from sales of property and equipment and other, net		(517)	1,853
Cash Flows from Investing Activities-Continuing Operations		(100,498)	(65,891)
Cash Flows from Investing Activities-Discontinued Operations		(10)	(1,141)
Cash Flows from Investing Activities		(100,508)	(67,032)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt		(355,367)	(635,539)
Proceeds from revolving credit and term loan facilities and other debt		386,506	701,105
Debt financing (repayment to) and equity contribution from (distribution to) noncontrolling interests, net		194	191
Stock repurchases			(38,052)
Parent cash dividends	(140,000)	(51,662)	(43,180)
Proceeds from exercise of stock options and employee stock purchase plan		5,005	1,321
Excess tax benefits from stock-based compensation		1,705	190
Payment of debt financing costs		(469)	(93)
Cash Flows from Financing Activities-Continuing Operations		(14,088)	(14,057)
Cash Flows from Financing Activities-Discontinued Operations			(39)
Cash Flows from Financing Activities		(14,088)	(14,096)
Effect of exchange rates on cash and cash equivalents		(5,425)	4,692
(Decrease) Increase in Cash and Cash Equivalents		(13,416)	(1,552)
Cash and Cash Equivalents, Beginning of Period		243,415	179,845
Cash and Cash Equivalents, End of Period		229,999	178,293
Parent
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations		(47,266)	(40,455)
Cash Flows from Operating Activities		(47,266)	(40,455)
Cash Flows from Investing Activities:
Intercompany loans to subsidiaries		95,719	116,821
Investment in subsidiaries		(3,500)
Investment in restricted cash		(1)	(2)
Cash Flows from Investing Activities-Continuing Operations		92,218	116,819
Cash Flows from Investing Activities		92,218	116,819
Cash Flows from Financing Activities:
Stock repurchases			(38,052)
Parent cash dividends		(51,662)	(43,180)
Proceeds from exercise of stock options and employee stock purchase plan		5,005	1,321
Excess tax benefits from stock-based compensation		1,705	190
Cash Flows from Financing Activities-Continuing Operations		(44,952)	(79,721)
Cash Flows from Financing Activities		(44,952)	(79,721)
(Decrease) Increase in Cash and Cash Equivalents			(3,357)
Cash and Cash Equivalents, Beginning of Period			3,428
Cash and Cash Equivalents, End of Period			71
Guarantors
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations		118,974	100,211
Cash Flows from Operating Activities-Discontinued Operations		(90)	(2,415)
Cash Flows from Operating Activities		118,884	97,796
Cash Flows from Investing Activities:
Capital expenditures		(61,795)	(31,371)
Cash paid for acquisitions, net of cash acquired		74	(8,818)
Intercompany loans to subsidiaries		(2,177)	(19,330)
Investment in subsidiaries		(3,500)
Additions to customer relationship and acquisition costs		(3,055)	(2,523)
Proceeds from sales of property and equipment and other, net		12	1,885
Cash Flows from Investing Activities-Continuing Operations		(70,441)	(60,157)
Cash Flows from Investing Activities-Discontinued Operations		(10)	(25)
Cash Flows from Investing Activities		(70,451)	(60,182)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt		(349,550)	(623,221)
Proceeds from revolving credit and term loan facilities and other debt		386,300	700,000
Intercompany loans from parent		(97,554)	(116,998)
Equity contribution from parent		3,500
Payment of debt financing costs		(469)	(93)
Cash Flows from Financing Activities-Continuing Operations		(57,773)	(40,312)
Cash Flows from Financing Activities		(57,773)	(40,312)
(Decrease) Increase in Cash and Cash Equivalents		(9,340)	(2,698)
Cash and Cash Equivalents, Beginning of Period		13,472	10,750
Cash and Cash Equivalents, End of Period		4,132	8,052
Canada Company
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations		4,161	4,108
Cash Flows from Operating Activities		4,161	4,108
Cash Flows from Investing Activities:
Capital expenditures		(1,983)	(2,828)
Additions to customer relationship and acquisition costs		(70)	(62)
Proceeds from sales of property and equipment and other, net		(3,191)	5
Cash Flows from Investing Activities-Continuing Operations		(5,244)	(2,885)
Cash Flows from Investing Activities		(5,244)	(2,885)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt		(850)	(715)
Intercompany loans from parent		(2,197)	(2,860)
Cash Flows from Financing Activities-Continuing Operations		(3,047)	(3,575)
Cash Flows from Financing Activities		(3,047)	(3,575)
Effect of exchange rates on cash and cash equivalents		(2,311)	1,623
(Decrease) Increase in Cash and Cash Equivalents		(6,441)	(729)
Cash and Cash Equivalents, Beginning of Period		103,500	68,907
Cash and Cash Equivalents, End of Period		97,059	68,178
Non-Guarantors
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations		29,866	15,195
Cash Flows from Operating Activities-Discontinued Operations		960	(1,760)
Cash Flows from Operating Activities		30,826	13,435
Cash Flows from Investing Activities:
Capital expenditures		(31,640)	(21,717)
Additions to customer relationship and acquisition costs		(1,511)	(423)
Proceeds from sales of property and equipment and other, net		2,662	(37)
Cash Flows from Investing Activities-Continuing Operations		(30,489)	(22,177)
Cash Flows from Investing Activities-Discontinued Operations			(1,116)
Cash Flows from Investing Activities		(30,489)	(23,293)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt		(4,967)	(11,603)
Proceeds from revolving credit and term loan facilities and other debt		206	1,105
Debt financing (repayment to) and equity contribution from (distribution to) noncontrolling interests, net		194	191
Intercompany loans from parent		6,209	22,367
Equity contribution from parent		3,500
Cash Flows from Financing Activities-Continuing Operations		5,142	12,060
Cash Flows from Financing Activities-Discontinued Operations			(39)
Cash Flows from Financing Activities		5,142	12,021
Effect of exchange rates on cash and cash equivalents		(3,114)	3,069
(Decrease) Increase in Cash and Cash Equivalents		2,365	5,232
Cash and Cash Equivalents, Beginning of Period		126,443	96,760
Cash and Cash Equivalents, End of Period		128,808	101,992
Eliminations
Cash Flows from Investing Activities:
Intercompany loans to subsidiaries		(93,542)	(97,491)
Investment in subsidiaries		7,000
Cash Flows from Investing Activities-Continuing Operations		(86,542)	(97,491)
Cash Flows from Investing Activities		(86,542)	(97,491)
Cash Flows from Financing Activities:
Intercompany loans from parent		93,542	97,491
Equity contribution from parent		(7,000)
Cash Flows from Financing Activities-Continuing Operations		86,542	97,491
Cash Flows from Financing Activities		$ 86,542	$ 97,491