Stock-Based Compensation - Summary of Changes in Unvested Options (Detail) (USD $)	3 Months Ended
	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price per share, Beginning balance	$ 18.05
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Ending balance	$ 18.18
Unvested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Beginning balance	7,592
Number of options, Granted
Number of options, Vested	(7,376)
Number of options, Cancelled	(209)
Number of options, Ending balance	7
Weighted-average exercise price per share, Beginning balance	$ 10.27
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Vested	$ 10.27
Weighted-average exercise price per share, Cancelled	$ 10.20
Weighted-average exercise price per share, Ending balance	$ 8.90
Weighted-average grant date fair value per option, Beginning balance	$ 8.26
Weighted-average grant date fair value per option, Granted
Weighted-average grant date fair value per option, Vested	$ 8.26
Weighted-average grant date fair value per option, Cancelled	$ 8.45
Weighted-average grant date fair value per option, Ending balance	$ 7.26