Segment and Geographic Information - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of business segment operated currently 1    
Geographic Concentration Risk [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Percentage of fixed assets into company's net assets 1.00%    
Geographic Concentration Risk [Member] | Minimum [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Company's consolidated net revenue 10.00% 10.00% 10.00%
Geographic Concentration Risk [Member] | Central America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Company's consolidated net revenue   14.00% 16.00%
Geographic Concentration Risk [Member] | Peru [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Company's consolidated net revenue 25.00% 20.00% 11.00%
Geographic Concentration Risk [Member] | Mexico [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Company's consolidated net revenue 17.00%    
Geographic Concentration Risk [Member] | Guatemala [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Company's consolidated net revenue   15.00%  
Geographic Concentration Risk [Member] | Puerto Rico [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Company's consolidated net revenue 12.00% 13.00%