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Foreign Currencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Schedule of Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 87,416	$ 87,416
Cumulative foreign currency translation loss, net of deferred income tax benefit	(3,713)	(3,713)	(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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