Foreign Currencies - Additional Information (Detail) (USD $) In Thousands	Sep. 30, 2011
Intercompany Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 85,424
Cumulative foreign currency translation loss, net of deferred income tax benefit	$ (3,875)

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