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Interest Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Income Expense Net [Line Items]
Interest income	$ 2,364	$ 1,196
Interest expense	(5,202)	(10,221)
Interest income (expense), net	$ (2,838)	$ (9,025)

X

- Definition

Interest Income Expense Net [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.

+ References

No definition available.

+ Details

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Namespace Prefix:	g_
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Balance Type:	credit
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X

- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

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Balance Type:	debit
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X

- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

+ Details

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