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Credit Agreement - Schedule of U.S. Credit Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Credit Agreements:    
Credit facility borrowings $ 80,000  
U.S. Credit Agreement [Member]
    
Credit Agreements:    
Credit facility remaining availability   178,310 [1]
Credit facility borrowings 80,000 [2]  
Outstanding letters of credit 6,981 [2],[3] 6,690 [1],[3]
Availability for additional letters of credit   43,310 [1]
Average daily revolving credit borrowings for the year ended $ 219 [2]  
Weighted average annual interest rate 5.25% [2] 0.00% [1]
Commitment fee rate 0.25% [2] 0.10% [1]
Letter of credit fee rate 0.50% [2],[3] 0.50% [1],[3]
[1] Details reflect terms under our previous U.S. Credit Agreement which expired October 31, 2012.
[2] Details reflect terms under our existing Credit Agreement which was entered into during December 2012, except for our outstanding letters of credit.
[3] Represents letters of credit which are fully collateralized with $7.4 million of restricted cash.