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Goodwill and Intangibles - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment loss	$ 0us-gaap_GoodwillImpairmentLoss
2014	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2015	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2016	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2017	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2018	$ 5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	$ 5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Amortization period		5 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of identified intangible assets		2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of identified intangible assets		30 years

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 50

-Paragraph 2

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 2

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

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