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Credit Agreement - Schedule of U.S. Credit Agreement (Detail) (U.S. Credit Agreement [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
U.S. Credit Agreement [Member]
    
Credit Agreements:    
Credit facility remaining availability $ 70,000 [1],[2]  
Credit facility borrowings   80,000 [3]
Outstanding letters of credit 12,318 [1],[4] 6,981 [3],[4]
Availability of additional letters of credit 7,682 [1],[2]  
Average daily revolving credit borrowings for the year ended $ 219 [1] $ 219 [3]
Weighted average annual interest rate 5.25% [1] 5.25% [3]
Commitment fee rate 0.25% [1] 0.25% [3]
Letter of credit fee rate 0.75% [1] 0.50% [3]
[1] Details reflect terms under our existing Credit Agreement which was entered into December 30, 2013, except for our outstanding letters of credit.
[2] The letters of credit sublimit of $20.0 million under our existing Credit Agreement is part of, not in addition to, the $70.0 million aggregate commitments.
[3] Details reflect terms under the original credit agreement which was replaced with our existing Credit Agreement, except for our outstanding letters of credit.
[4] Represents letters of credit which are fully collateralized with $12.6 million and $7.4 million of restricted cash as of December 31, 2013 and 2012, respectively.