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Schedule of Investments in Term Deposits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Cost	$ 466,625us-gaap_OtherShortTermInvestments	$ 340,349us-gaap_OtherShortTermInvestments	$ 266,107us-gaap_OtherShortTermInvestments
Maturities of term deposits	445,717	288,719	194,873
Purchases of term deposits	$ 583,341	$ 395,589	$ 277,116

- Definition

Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer.

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