Goodwill and Other Intangible Assets - Summary of Other Intangible Assets and Related Accumulated Amortization (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	$ 97,759	$ 97,046
Accumulated amortization	(63,037)	(58,060)
Total intangibles, net	34,722	38,986
Customer related intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	61,325	60,547
Accumulated amortization	(33,194)	(28,864)
Acquired software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	33,103	32,003
Accumulated amortization	(28,441)	(26,584)
Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	3,331	3,109
Accumulated amortization	(1,402)	(1,225)
Lease acquired [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross		1,387
Accumulated amortization		$ (1,387)

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

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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

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