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Investments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
GS Internacional S/A
Jun. 30, 2013
GS Internacional S/A
Jun. 30, 2014
GS Internacional S/A
Jun. 30, 2013
GS Internacional S/A
Jun. 30, 2014
Grupo Vasconia S.A.B.
Jun. 30, 2013
Grupo Vasconia S.A.B.
Jun. 30, 2014
Grupo Vasconia S.A.B.
Jun. 30, 2013
Grupo Vasconia S.A.B.
Dec. 31, 2013
Grupo Vasconia S.A.B.
Jun. 30, 2014
Grupo Vasconia S.A.B.
Transaction 02
Minimum
Jun. 30, 2013
Grupo Vasconia S.A.B.
Transaction 02
Minimum
Jun. 30, 2014
Grupo Vasconia S.A.B.
Transaction 02
Maximum
Jun. 30, 2013
Grupo Vasconia S.A.B.
Transaction 02
Maximum
Jun. 30, 2014
Grand Venture
Jun. 30, 2013
Grand Venture
Jun. 30, 2014
Grand Venture
Jun. 30, 2013
Grand Venture
Dec. 31, 2013
Grand Venture
Feb. 29, 2012
Grand Venture
Jun. 30, 2014
HCA
Dec. 31, 2013
HCA
Dec. 31, 2011
HCA
Schedule of Equity Method Investments [Line Items]                                                    
Percentage of ownership in equity method investment         40.00%   40.00%   30.00%   30.00%                       50.00%     40.00%
Exchange rate at period end - MXN to USD                 12.97   12.97   13.06                          
Average daily exchange rate for period - MXN to USD                 12.99 12.46       13.00 12.57 13.10 12.79                  
Increase (decrease) in equity method investment                     $ 600,000 $ 100,000                            
Due from related party                 12,000   12,000   152,000                          
Equity in earnings (losses), net of taxes 41,000 92,000 (167,000) 338,000 234,000 243,000 447,000 266,000 300,000 400,000 300,000 600,000           20,000 10,000 5,000 37,000          
Fair value of investment                 35,000,000   35,000,000   35,200,000                          
Carrying value of investment                 31,500,000   31,500,000   30,500,000         300,000   300,000   300,000   129,000 144,000  
Payment for equity method investment                                             $ 500,000     $ 105,000