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Income taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax [Line Items]              
Provision for income tax $ 2,997,000 $ 3,823,000 $ 7,678,000 $ 10,294,000      
Income tax effective rate (as a percent)     39.50% 36.30%      
Income tax effective rate excluding the impact of the charges related to the U.S. Government resolutions (as a percent)     39.50% 40.30%      
Legal settlement expenses       400,000      
Unrecognized tax benefit 800,000   800,000     1,200,000  
Accrued interest and penalties related to unrecognized tax benefits         900,000 900,000  
Recognition of uncertain tax benefits     Accounting guidance only allows the recognition of those tax benefits that have a greater than 50% likelihood of being sustained upon examination by the taxing authorities.        
Unremitted foreign earnings           292,000,000 285,300,000
U.S. Subsidiary [Member]
              
Income Tax [Line Items]              
Unremitted foreign earnings           $ 293,800,000