Foreign Currencies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
Schedule of Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 68,086,000	$ 68,086,000
Cumulative foreign currency translation loss, net of deferred income tax benefit	(12,712,000)	(12,712,000)	(3,261,000)
Amount reclassified to net income	$ 0	$ 0