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Income Tax (Expense) Recovery - Unrecognized Tax Benefits, Recorded in Other Long-Term Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Balance of unrecognized tax benefits as at January 1, 2013	$ 29,364
Decrease for positions taken in prior years	(267)
Decrease for positions related to the current period	(924)
Decrease related to statute of limitations	(388)
Balance of unrecognized tax benefits as at June 30, 2013	$ 27,785

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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-Name Accounting Standards Codification

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