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Cost and Fair Value of Investments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
At start of year	$ 76,183	$ 54,940
Additions	172,168	102,575
Disposals	(109,795)	(82,193)
Unrealized capital gain/(loss) - investments	(239)	861
At end of year	$ 138,317	$ 76,183

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Available For Sale Securities, Debt Securities Current, Additions

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

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