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Derivative Instruments (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 Interest Rate Swap [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2013 Interest Rate Swap [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2014 Interest Rate Swap [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2013 Interest Rate Swap [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2014 Foreign Currency Gain (Loss) [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2013 Foreign Currency Gain (Loss) [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2014 Foreign Currency Gain (Loss) [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Sep. 30, 2013 Foreign Currency Gain (Loss) [Member] Gain (Loss) on Derivative Instruments [Member] USD ($)	Apr. 30, 2014 Forward Contracts [Member] USD ($)	Apr. 30, 2014 Short [Member] Forward Contracts [Member] GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount													$ 57,631	£ 34,389
Loss on derivative instruments-realized					0	(24)	0	(156)
Unrealized gains (losses) on derivative instruments	3,026	25	1,933	155	0	25	0	155	3,026	0	1,933	0
Total	$ 3,026	$ 1	$ 1,933	$ (1)

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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