Stock-Based Compensation - Summary of Changes in Unvested Restricted Stock Units (Parenthetical) (Detail)	3 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted unit vest and convert into shares of common stock on date of grant	11,765
Number of restricted unit vest and convert into common stock over next fiscal year	25,000
Vesting period of grant date	1 year
Number of restricted unit would vest over vesting period	2,250,000
Restricted stock units vested description after specified period	25
Restricted stock unit vest description	2,250,000 of these restricted stock units will vest and convert into shares of our common stock over a four year period
Restricted Stock One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vest and convert into shares of our common stock	1 year

25,000

2,250,000

2,250,000 of these restricted stock units will vest and convert into shares of our common stock over a four year period