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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Equity [Abstract]        
Unrealized Gains on Investments, Beginning Balance     $ 275  
Other comprehensive income before reclassification, Unrealized gains on investments     91  
Amounts reclassified from AOCI, net of tax     (36) (8)
Net other comprehensive income (loss)     55  
Unrealized Gains on Investments, Ending Balance 330   330  
Cumulative Foreign Currency Translation Adjustments, Beginning Balance     42,158  
Other comprehensive income before reclassification, Cumulative Foreign Currency Translation Adjustments (5,295) (3,390) (11,423) 996
Amounts reclassified from AOCI, net of tax, Cumulative Foreign Currency Translation Adjustments         
Net other comprehensive income (loss), Accumulated Other Comprehensive Income     (11,423)  
Cumulative Foreign Currency Translation Adjustments, Ending Balance 30,735   30,735  
Unrecognized Net Actuarial loss and Prior Service Credit, Beginning Balance     (14,968)  
Other comprehensive income before reclassifications, Unrecognized Net Actuarial loss and Prior Service Credit          
Amounts reclassified from AOCI, net of tax, Unrecognized Net Actuarial loss and Prior Service Credit     81 4
Net other comprehensive income (loss), Unrecognized Net Actuarial loss and Prior Service Credit     81  
Unrecognized Net Actuarial Loss and Prior Service Credit, Ending Balance (14,887)   (14,887)  
Accumulated Other Comprehensive Income, Beginning Balance     27,465  
Other Comprehensive Income before reclassification, Accumulated Other Comprehensive Income     (11,332)  
Accumulated Other Comprehensive Income     45  
Net other comprehensive income (loss), Accumulated Other Comprehensive Income (5,261) (3,430) (11,287) 1,052
Accumulated Other Comprehensive Income, Ending Balance $ 16,178   $ 16,178