Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail)

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Shareholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ (31,695,000)  
Other comprehensive income (loss) before reclassifications, net of tax     (400,000)  
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax     4,700,000  
Total other comprehensive income (loss) 16,912,000 6,302,000 4,324,000 1,184,000
Ending balance (27,371,000)   (27,371,000)  
Foreign Currency Translation Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (28,800,000)  
Other comprehensive income (loss) before reclassifications, net of tax     (2,900,000)  
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax         
Total other comprehensive income (loss)     (2,900,000)  
Ending balance (31,700,000)   (31,700,000)  
Unrealized Gain (Loss) on Derivatives [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (2,900,000)  
Other comprehensive income (loss) before reclassifications, net of tax     2,500,000  
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax     4,700,000  
Total other comprehensive income (loss)     7,200,000  
Ending balance $ 4,300,000   $ 4,300,000