Time Based Option Awards Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	May 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period	5,870,138	1,956,713	5,870,138
Exercised	(174,467)	0
Awards vested at IPO		3,913,425
Outstanding at end of period	5,695,671	5,870,138	5,870,138
Options exercisable at end of period	5,695,671
Weighted average fair value of options granted	$ 2.20	$ 2.20