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		6 Months Ended
	Nov. 21, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations				$ 212,948	$ 216,855
Cash Flows from Operating Activities-Discontinued Operations				953	(4,665)
Cash Flows from Operating Activities				213,901	212,190
Cash Flows from Investing Activities:
Capital expenditures		(62,822)	(51,445)	(158,240)	(107,361)
Cash paid for acquisitions, net of cash acquired		(52,866)	(98,472)	(52,792)	(107,290)
Investment in restricted cash				(1)	(1,502)
Additions to customer relationship and acquisition costs		(3,625)	(5,136)	(8,261)	(8,144)
Proceeds from sales of property and equipment and other, net				2,899	1,862
Cash Flows from Investing Activities-Continuing Operations				(216,395)	(222,435)
Cash Flows from Investing Activities-Discontinued Operations				(18)	(6,136)
Cash Flows from Investing Activities				(216,413)	(228,571)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt				(987,166)	(1,768,694)
Proceeds from revolving credit and term loan facilities and other debt				1,099,939	1,888,264
Debt financing (repayment to) and equity contribution from (distribution to) noncontrolling interests, net				874	385
Stock repurchases					(38,052)
Parent cash dividends	(140,000)			(103,309)	(85,971)
Proceeds from exercise of stock options and employee stock purchase plan				14,897	11,029
Excess tax benefits from stock-based compensation				2,394	254
Payment of debt financing costs				(711)	(93)
Cash Flows from Financing Activities-Continuing Operations				26,918	7,122
Cash Flows from Financing Activities-Discontinued Operations					(39)
Cash Flows from Financing Activities				26,918	7,083
Effect of exchange rates on cash and cash equivalents				(8,955)	(317)
(Decrease) Increase in Cash and Cash Equivalents				15,451	(9,615)
Cash and Cash Equivalents, Beginning of Period				243,415	179,845
Cash and Cash Equivalents, End of Period		258,866	170,230	258,866	170,230
Parent
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations				(90,898)	(87,906)
Cash Flows from Operating Activities				(90,898)	(87,906)
Cash Flows from Investing Activities:
Intercompany loans to subsidiaries				193,217	234,913
Investment in subsidiaries				(16,300)	(36,193)
Investment in restricted cash				(1)	(1,502)
Cash Flows from Investing Activities-Continuing Operations				176,916	197,218
Cash Flows from Investing Activities				176,916	197,218
Cash Flows from Financing Activities:
Stock repurchases					(38,052)
Parent cash dividends				(103,309)	(85,971)
Proceeds from exercise of stock options and employee stock purchase plan				14,897	11,029
Excess tax benefits from stock-based compensation				2,394	254
Cash Flows from Financing Activities-Continuing Operations				(86,018)	(112,740)
Cash Flows from Financing Activities				(86,018)	(112,740)
(Decrease) Increase in Cash and Cash Equivalents					(3,428)
Cash and Cash Equivalents, Beginning of Period					3,428
Guarantors
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations				227,437	249,123
Cash Flows from Operating Activities-Discontinued Operations				(129)	(2,651)
Cash Flows from Operating Activities				227,308	246,472
Cash Flows from Investing Activities:
Capital expenditures				(104,352)	(55,276)
Cash paid for acquisitions, net of cash acquired				(23,338)	(9,043)
Intercompany loans to subsidiaries				(11,865)	(78,762)
Investment in subsidiaries				(16,300)	(36,193)
Additions to customer relationship and acquisition costs				(5,885)	(6,179)
Proceeds from sales of property and equipment and other, net				12	1,898
Cash Flows from Investing Activities-Continuing Operations				(161,728)	(183,555)
Cash Flows from Investing Activities-Discontinued Operations				(18)	(1,982)
Cash Flows from Investing Activities				(161,746)	(185,537)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt				(975,507)	(1,712,961)
Proceeds from revolving credit and term loan facilities and other debt				1,076,791	1,856,000
Intercompany loans from parent				(191,997)	(239,345)
Equity contribution from parent				16,300	36,193
Payment of debt financing costs				(469)	(93)
Cash Flows from Financing Activities-Continuing Operations				(74,882)	(60,206)
Cash Flows from Financing Activities				(74,882)	(60,206)
(Decrease) Increase in Cash and Cash Equivalents				(9,320)	729
Cash and Cash Equivalents, Beginning of Period				13,472	10,750
Cash and Cash Equivalents, End of Period		4,152	11,479	4,152	11,479
Canada Company
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations				16,649	19,935
Cash Flows from Operating Activities				16,649	19,935
Cash Flows from Investing Activities:
Capital expenditures				(3,917)	(7,000)
Additions to customer relationship and acquisition costs				(290)	(350)
Proceeds from sales of property and equipment and other, net				(3,191)	5
Cash Flows from Investing Activities-Continuing Operations				(7,398)	(7,345)
Cash Flows from Investing Activities				(7,398)	(7,345)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt				(1,613)	(1,447)
Intercompany loans from parent				2,282	(1,758)
Cash Flows from Financing Activities-Continuing Operations				669	(3,205)
Cash Flows from Financing Activities				669	(3,205)
Effect of exchange rates on cash and cash equivalents				(5,736)	344
(Decrease) Increase in Cash and Cash Equivalents				4,184	9,729
Cash and Cash Equivalents, Beginning of Period				103,500	68,907
Cash and Cash Equivalents, End of Period		107,684	78,636	107,684	78,636
Non-Guarantors
Cash Flows from Operating Activities:
Cash Flows from Operating Activities-Continuing Operations				59,760	35,703
Cash Flows from Operating Activities-Discontinued Operations				1,082	(2,014)
Cash Flows from Operating Activities				60,842	33,689
Cash Flows from Investing Activities:
Capital expenditures				(49,971)	(45,085)
Cash paid for acquisitions, net of cash acquired				(29,454)	(98,247)
Additions to customer relationship and acquisition costs				(2,086)	(1,615)
Proceeds from sales of property and equipment and other, net				6,078	(41)
Cash Flows from Investing Activities-Continuing Operations				(75,433)	(144,988)
Cash Flows from Investing Activities-Discontinued Operations					(4,154)
Cash Flows from Investing Activities				(75,433)	(149,142)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt				(10,046)	(54,286)
Proceeds from revolving credit and term loan facilities and other debt				23,148	32,264
Debt financing (repayment to) and equity contribution from (distribution to) noncontrolling interests, net				874	385
Intercompany loans from parent				8,363	84,952
Equity contribution from parent				16,300	36,193
Payment of debt financing costs				(242)
Cash Flows from Financing Activities-Continuing Operations				38,397	99,508
Cash Flows from Financing Activities-Discontinued Operations					(39)
Cash Flows from Financing Activities				38,397	99,469
Effect of exchange rates on cash and cash equivalents				(3,219)	(661)
(Decrease) Increase in Cash and Cash Equivalents				20,587	(16,645)
Cash and Cash Equivalents, Beginning of Period				126,443	96,760
Cash and Cash Equivalents, End of Period		147,030	80,115	147,030	80,115
Eliminations
Cash Flows from Investing Activities:
Intercompany loans to subsidiaries				(181,352)	(156,151)
Investment in subsidiaries				32,600	72,386
Cash Flows from Investing Activities-Continuing Operations				(148,752)	(83,765)
Cash Flows from Investing Activities				(148,752)	(83,765)
Cash Flows from Financing Activities:
Intercompany loans from parent				181,352	156,151
Equity contribution from parent				(32,600)	(72,386)
Cash Flows from Financing Activities-Continuing Operations				148,752	83,765
Cash Flows from Financing Activities				$ 148,752	$ 83,765