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Debt - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Apr. 02, 2012
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2012
USD ($)
Jul. 20, 2011
Bank Of America, N.A. Seoul Branch [Member]
USD ($)
Apr. 06, 2011
Bank Of America, N.A. Seoul Branch [Member]
USD ($)
Jun. 30, 2012
Prime Rate [Member]
Jun. 30, 2012
Federal Funds Rate [Member]
Jun. 30, 2012
Libor Rate [Member]
USD ($)
Jun. 30, 2012
Base Rate [Member]
USD ($)
Jun. 30, 2012
Swingline Loan [Member]
USD ($)
Jun. 30, 2012
Revolving Credit Facility [Member]
USD ($)
Jun. 30, 2012
Credit Agreement Interest Rate Option One [Member]
Leverage Ratio Less Than One To One [Member]
Jun. 30, 2012
Credit Agreement Interest Rate Option Two [Member]
Leverage Ratio Greater Than Or Equal To Two To One [Member]
Dec. 17, 2010
Revolving Credit Loans [Member]
USD ($)
Dec. 17, 2010
Swingline [Member]
USD ($)
Apr. 02, 2012
Extended Maturity [Member]
Jun. 30, 2012
Maximum [Member]
Apr. 02, 2012
Maximum [Member]
USD ($)
Jun. 30, 2012
Maximum [Member]
Bank Of America, N.A. Seoul Branch [Member]
USD ($)
Jun. 30, 2012
Maximum [Member]
Bank Of America, N.A. Seoul Branch [Member]
KRW
Jun. 30, 2012
Maximum [Member]
Libor Rate Adjustment [Member]
Jun. 30, 2012
Minimum [Member]
Apr. 02, 2012
Minimum [Member]
USD ($)
Jun. 30, 2012
Minimum [Member]
Bank Of America, N.A. Seoul Branch [Member]
Jun. 30, 2012
Minimum [Member]
Credit Agreement Interest Rate Option Two [Member]
Leverage Ratio Less Than One To One [Member]
Debt Instrument [Line Items]                                                  
Revolving credit loans, maximum borrowing capacity                           $ 300,000,000 $ 20,000,000                    
Uncommitted incremental revolving credit commitment 50,000,000                                 350,000,000         300,000,000    
Line of credit expiration date Dec. 17, 2013     Aug. 20, 2012                       Dec. 17, 2014                  
Interest rate       4.45%   3.25%                                      
Debt instrument basis spread on variable rate         3.54%   1.50% 1.50%                     1.30% 1.30%       1.20%  
Debt Instrument Base               0.20%                                  
Consolidated leverage ratio percentage                       0.25%         1.00%                
Leverage ratio                       1.00 2.00                        
LIBOR rate                                         2.00% 1.00%     1.25%
Unused commitment fee percentage                                 0.35%         0.20%      
Minimum principal amounts               5,000,000 2,000,000 100,000.0 3,000,000                            
Debt instrument increments in excess of minimum principal amount               1,000,000 1,000,000 100,000 1,000,000                            
Credit Facility Amount Outstanding   97,000,000 97,000,000 6,200,000                                          
Available borrowings under the revolver   252,100,000 252,100,000                                            
Interest expense   653,000 653,000                                            
Maximum consolidated leverage ratio,numerator                                 2.50                
Consolidated tangible net worth     600,000,000                                            
Percentage of positive consolidated net worth     25.00%                                            
Maximum capital expenditures subject to adjustments     125,000,000                                            
Korea-based borrowings         20,000,000                           6,000,000 7,000,000          
Interest expense related to short term borrowing   $ 89,000 $ 165,000