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Foreign Currencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 45,829,000
Cumulative foreign currency translation loss, net of deferred income tax benefit	(22,969,000)	(3,261,000)
Amount reclassified to net income	0
Income taxes	37,283,000us-gaap_IncomeTaxExpenseBenefit	40,315,000us-gaap_IncomeTaxExpenseBenefit	52,657,000us-gaap_IncomeTaxExpenseBenefit
Foreign Currency Exchange Loss, Net
Schedule of Foreign Currency Balance [Line Items]
Income taxes	$ 0

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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