Carrying Amount of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 538,549	$ 530,123
Accumulated amortization	(200,301)	(162,343)
Net carrying amount	338,248	367,780
Customer relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	14 years	14 years
Gross amount	312,811	314,036
Accumulated amortization	(89,909)	(73,180)
Net carrying amount	222,902	240,856
Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	39,950	39,950
Accumulated amortization	(13,856)	(11,258)
Net carrying amount	26,094	28,692
Trademarks [Member] | Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	10 years	10 years
Trademarks [Member] | Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	15 years	15 years
Software packages [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	129,249	119,598
Accumulated amortization	(81,459)	(65,655)
Net carrying amount	47,790	53,943
Software packages [Member] | Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	3 years	3 years
Software packages [Member] | Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	10 years	10 years
Non-compete agreement [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	15 years	15 years
Gross amount	56,539	56,539
Accumulated amortization	(15,077)	(12,250)
Net carrying amount	$ 41,462	$ 44,289