Annual report pursuant to Section 13 and 15(d)

Foreign Currency Translation - Additional Information (Detail)

v2.4.0.6
Foreign Currency Translation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
May 31, 2011
Foreign Currency Translation [Line Items]      
Accumulated other comprehensive Income (Loss) $ (37,698) $ (23,682)  
Cumulative foreign currency adjustments (11,325) (31,330)  
Chile
     
Foreign Currency Translation [Line Items]      
Accumulated other comprehensive Income (Loss) 2,958 (3,324)  
Company's ownership in its Chilean subsidiary, before share exchange     97.40%
Company's ownership in its Chilean subsidiary, after share exchange     100.00%
Accumulated other comprehensive loss previously allocated to noncontrolling interest     $ 485