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Comprehensive income (loss) - Schedule of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Stockholders Equity [Abstract]
Net income (loss)	$ (19,822)	$ 5,016	$ (17,639)	$ 21,677
Other comprehensive income (loss):
Unrealized gain (loss) on cross-currency swap, net of tax of $275	582	253	486	177
Foreign currency translation adjustment	3,176	1,171	(273)	215
Total comprehensive income (loss)	$ (16,064)	$ 6,440	$ (17,426)	$ 22,069

X

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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