Other, Net - Other Net in Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Nonoperating Income Expense [Abstract]
Foreign exchange loss	$ (220)	$ (1,495)	$ (304)
Investment related income	1,269us-gaap_InvestmentIncomeNet	1,055us-gaap_InvestmentIncomeNet	173us-gaap_InvestmentIncomeNet
Realized and unrealized gain on investments	241us-gaap_GainLossOnInvestments	2,611us-gaap_GainLossOnInvestments	1,460us-gaap_GainLossOnInvestments
Other, net	$ 1,290us-gaap_OtherNonoperatingIncomeExpense	$ 2,171us-gaap_OtherNonoperatingIncomeExpense	$ 1,329us-gaap_OtherNonoperatingIncomeExpense

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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