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Income taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current deferred tax asset	$ 3,106	$ 693
Non-current deferred tax liability	3,106	693
Benefit from income taxes	$ 11,797

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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