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Derivatives and Hedging - Additional Information (Detail)
0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 24, 2010
2010 Swap [Member]
Sep. 30, 2014
2010 Swap [Member]
USD ($)
Dec. 31, 2013
2010 Swap [Member]
USD ($)
Jun. 24, 2010
2010 Swap [Member]
USD ($)
May 20, 2013
2013 Rate Cap No. 1 [Member]
USD ($)
Sep. 30, 2014
2013 Rate Cap No. 1 [Member]
May 20, 2013
2013 Rate Cap No. 2 [Member]
USD ($)
Sep. 30, 2014
2013 Rate Cap No. 2 [Member]
Sep. 30, 2014
2013 FX Contracts [Member]
USD ($)
Sep. 30, 2014
2013 FX Contracts [Member]
CAD
Dec. 31, 2013
2013 FX Contracts [Member]
CAD
Sep. 30, 2014
2013 FX Contracts [Member]
Minimum [Member]
Dec. 31, 2013
2013 FX Contracts [Member]
Minimum [Member]
Sep. 30, 2014
2013 FX Contracts [Member]
Maximum [Member]
Dec. 31, 2013
2013 FX Contracts [Member]
Maximum [Member]
Sep. 03, 2014
2014 Swap No. 1 [Member]
Sep. 30, 2014
2014 Swap No. 1 [Member]
Sep. 03, 2014
2014 Swap No. 1 [Member]
USD ($)
Sep. 03, 2014
2014 Swap No. 2 [Member]
Sep. 30, 2014
2014 Swap No. 2 [Member]
Sep. 03, 2014
2014 Swap No. 2 [Member]
USD ($)
Dec. 31, 2013
2014 FX Contracts [Member]
USD ($)
Mar. 31, 2014
2014 FX Contracts [Member]
Minimum [Member]
Jun. 30, 2014
2014 FX Contracts [Member]
Minimum [Member]
Sep. 30, 2014
2014 FX Contracts [Member]
Minimum [Member]
Mar. 31, 2014
2014 FX Contracts [Member]
Maximum [Member]
Jun. 30, 2014
2014 FX Contracts [Member]
Maximum [Member]
Sep. 30, 2014
2014 FX Contracts [Member]
Maximum [Member]
Sep. 30, 2014
Foreign Exchange Forward Contract [Member]
USD ($)
Derivative [Line Items]                                                              
Term of derivative instrument     2 years       2 years   2 years                 3 years     3 years                    
Notional amount of derivative instrument           $ 115,000,000 $ 150,000,000   $ 75,000,000       44,591,000             $ 90,000,000     $ 40,000,000                
Fixed interest rate of Swap Agreement           2.47%                           2.20%     2.20%                
Effective date of agreement       May 31, 2011       May 28, 2013   May 28, 2013                 Oct. 01, 2015     Oct. 01, 2015                  
Termination date of derivative       May 31, 2013       Jun. 19, 2014   Jun. 19, 2014       Jul. 31, 2013   Dec. 31, 2014     Sep. 30, 2018     Sep. 30, 2018     Mar. 31, 2014 Mar. 31, 2014 Mar. 31, 2014 Sep. 30, 2015 Sep. 30, 2015 Sep. 30, 2015  
Fair value of interest expense       418,000                                                      
Fair value of derivative liability       0 0                                     (42,000)              
Fair value interest rate swaps 137,000                                                            
LIBOR interest rate             1.25%   1.25%                                            
Fair value of interest rate caps 0 53,000                                                          
Forward exchange rate                             1.02940   1.08210                   1.06800     1.12670  
Notional amount of derivative contracts outstanding                       29,115,000 26,856,000                                    
Fair value of derivative asset                     782,000                                        
Increase in other income                                                             $ 824,000