Basic and Diluted Net Income (Loss) Per Share Attributable to Ordinary Shareholders (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic net income per share attributable to ordinary shareholders:
Net income	$ 30,457	$ 5,408	$ 2,869
Accretion of redeemable convertible preferred shares to redemption value		(335)	(446)
Net income attributable to participating securities			(2,294)
Net income attributable to ordinary shareholders	30,457	5,073	129
Weighted average ordinary shares outstanding-basic	35,722,300	8,822,169	1,497,150
Net income per share attributable to ordinary shareholders-basic	$ 0.85	$ 0.58	$ 0.09
Diluted net income per share attributable to ordinary shareholders:
Net income	30,457	5,408	2,869
Accretion of redeemable convertible preferred shares to redemption value		(335)	(446)
Net income attributable to participating securities			(2,248)
Net income attributable to ordinary shareholders-diluted	$ 30,457	$ 5,073	$ 175
Weighted average ordinary shares outstanding-basic	35,722,300	8,822,169	1,497,150
Dilutive effect of ordinary share equivalents	1,417,539	1,262,411	580,442
Weighted average ordinary shares outstanding-diluted	37,139,839	10,084,580	2,077,592
Net income per share attributable to ordinary shareholders-diluted	$ 0.82	$ 0.50	$ 0.08