Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		3 Months Ended		3 Months Ended	1 Months Ended
	Mar. 31, 2014	Jun. 30, 2014 Forecast [Member]	Apr. 30, 2014 Subsequent Event [Member]	Jun. 30, 2014 Convertible Senior Notes [Member] Forecast [Member]	Apr. 30, 2014 Convertible Senior Notes [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Cancellation of convertible notes					$ 56.3
Aggregate consideration for convertible notes					120.2
Value of convertible notes converted by a holder				15.3
Face amount of outstanding debt					232.2
Loss on extinguishment on Debt		1.6
Consideration received from counter parties					$ 9.2
Approximate number of common stock share under purchased option reduced	14.4		11.0
Approximate number of common stock share which can be purchased under warrants	14.5		11.8