Foreign Currencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Schedule of Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 92,375
Cumulative foreign currency translation loss, net of deferred income tax benefit	(2,392)	(1,940)
Amount reclassified to net income

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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+ Details

- Definition

Amounts reclassified from other comprehensive income to earnings during the period related to translation from functional currency to reporting currency, as a result of the sale or complete or substantially complete liquidation of an investment in a foreign entity. Net of tax effect.

+ References+ Details