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Accrued Liabilities and Deferred Credits (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Line Items]
Accrued compensation	$ 1,962	$ 3,529
Deferred revenue	27,846	27,962
Environmental and insurance liabilities	1,610	1,621
Other accrued liabilities	15,927	9,240
Total accrued liabilities and deferred credits	$ 47,345	$ 42,352

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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