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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]          
Effective tax rate     17.00% 21.00%  
Expected tax rate 17.00%   34.00%    
Expected tax rate   21.00%      
US NOL carryforwards         $ 11,620
U.S. tax deductions for employee stock option gains, the tax benefit         9,093
Expiry Date of Operating Loss carryforward     2022 to 2032    
Foreign NOL carryforwards         5,279
Other Foreign Deductible carryforwards         3,491
Expiry Date of other deductible carryforwards     2016-2019    
Foreign Tax Authority [Member]
          
Operating Loss Carryforwards [Line Items]          
Valuation allowance for deferred tax assets         $ 2,284