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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 611,373	$ 607,211
Accumulated amortization	(320,154)	(308,092)
Net carrying amount	291,219	299,119
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	334,455	334,455
Accumulated amortization	(148,295)	(141,829)
Net carrying amount	$ 186,160	$ 192,626
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	8 years	8 years
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	14 years	14 years
Trademark
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 39,950	$ 39,950
Accumulated amortization	(22,516)	(21,650)
Net carrying amount	$ 17,434	$ 18,300
Trademark | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	10 years	10 years
Trademark | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	15 years	15 years
Software packages
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 180,429	$ 176,267
Accumulated amortization	(124,843)	(121,055)
Net carrying amount	$ 55,586	$ 55,212
Software packages | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	3 years	3 years
Software packages | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	10 years	10 years
Non-compete agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	15 years	15 years
Gross amount	$ 56,539	$ 56,539
Accumulated amortization	(24,500)	(23,558)
Net carrying amount	$ 32,039	$ 32,981

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+ References

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=66006027&loc=d3e16323-109275

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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=66006027&loc=d3e16323-109275

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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