Summary of Significant Accounting Policies - Schedule of Components of Amortizable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Amortizable intangible assets
Gross carrying amount	$ 952,931		$ 978,529
Accumulated amortization	(325,800)		(321,593)
Net carrying amount	627,131us-gaap_FiniteLivedIntangibleAssetsNet		656,936us-gaap_FiniteLivedIntangibleAssetsNet
Amortization of other deferred charges	13,252	13,626
Customer Relationships and Acquisition Costs
Amortizable intangible assets
Gross carrying amount	880,221		904,866
Accumulated amortization	(299,780)		(297,029)
Net carrying amount	580,441		607,837
Core Technology
Amortizable intangible assets
Gross carrying amount	3,349		3,568
Accumulated amortization	(3,315)		(3,540)
Net carrying amount	34		28
Trademarks and Non-Compete Agreements
Amortizable intangible assets
Gross carrying amount	6,469		7,062
Accumulated amortization	(4,874)		(5,068)
Net carrying amount	1,595		1,994
Deferred Financing Costs
Amortizable intangible assets
Gross carrying amount	62,892		63,033
Accumulated amortization	(17,831)		(15,956)
Net carrying amount	$ 45,061		$ 47,077

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount of amortization of other deferred costs recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

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