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Description of Business Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Depreciation	$ 51,000,000us-gaap_Depreciation	$ 48,000,000us-gaap_Depreciation	$ 41,000,000us-gaap_Depreciation
Goodwill impairment charges	$ 0us-gaap_GoodwillImpairmentLoss	$ 0us-gaap_GoodwillImpairmentLoss	$ 0us-gaap_GoodwillImpairmentLoss
Antidilutive options to purchase were excluded from computation of diluted earnings per share	2,400,000	900,000	0
Internal-Use Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Period capitalized on a straight-line basis when the asset is substantially ready for use	3 years
Capitalized Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortizable period	4 years
Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Fees payment term (in days)	30 days
Intangible assets amortizable period
Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Fees payment term (in days)	90 days
Intangible assets amortizable period
Equipment \| Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Lives	3 years
Equipment \| Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Lives	20 years
Building \| Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Lives	25 years
Building \| Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated Useful Lives	45 years