Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, shares	0.1
Weighted average grant date fair values per share, options granted for purchase of common stock	$ 3.89
Restricted stock units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted, shares	1.1
Weighted average grant date fair values per share, restricted stock units granted	$ 9.84
Restricted stock units with service and market conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted, shares	0.1