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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Taxes [Line Items]            
Effective tax rate 29.10%   31.30% 29.00% 23.90%  
Gross unrecognized tax benefits excluding interest and penalties $ 19,508     $ 19,508   $ 19,610
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate 11,524     11,524    
Accrued interest on unrecognized tax benefits $ 701     701   $ 578
Unrecognized tax benefits related to various U.S. federal, state and foreign tax positions       $ 950    
Income tax examination, description       The Company and its subsidiaries are subject to examination by federal, state and foreign tax authorities. The Internal Revenue Service commenced an examination of the Company's U.S. federal tax filings for tax years 2011 through 2013 during the quarter ended March 31, 2015.    
Earliest Tax Year [Member]            
Income Taxes [Line Items]            
Income tax examination period   2011        
Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]            
Income Taxes [Line Items]            
Open tax year   2011        
Latest Tax Year [Member]            
Income Taxes [Line Items]            
Income tax examination period   2013