Net income (loss) Per Ordinary Share - Calculation of Basic and Diluted Net Income or Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income (loss)	$ (13,182)	$ (9,689)	$ 5,960	$ (29,942)
Denominator
Weighted-average ordinary shares outstanding (in shares)	27,370	17,679	23,758	17,679
Dilutive stock options outstanding (in shares)	0	0	964	0
Net weighted average ordinary shares outstanding (in shares)	27,370	17,679	24,722	17,679
Net income (loss) per share attributable to holders of ordinary shares
Basic (in dollars per share)	$ (0.48)	$ (0.55)	$ 0.25	$ (1.69)
Diluted (in dollars per share)	$ (0.48)	$ (0.55)	$ 0.24	$ (1.69)