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Segment Reporting - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Segment
Jun. 30, 2013
Schedule Of Geographical Information [Line Items]        
Number of reporting segments     2  
Inter-segment revenues $ 9,667 $ 7,712 $ 18,187 $ 15,642
Intersegment Eliminations [Member]
       
Schedule Of Geographical Information [Line Items]        
Inter-segment revenues     $ 0