Common Stock (Detail) (USD $)	6 Months Ended	0 Months Ended
	Jun. 30, 2014	May 29, 2014 FOLLOW-ON PUBLIC OFFERING [Member]	May 29, 2014 Common Stock [Member] FOLLOW-ON PUBLIC OFFERING [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction			7,500,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs	$ (590,000)	$ 600,000
Sale of Stock, Consideration Received on Transaction		181,300,000
Repayments of Debt		180,000,000
Proceeds From Public Offering Used to Fund Working Capital		$ 1,300,000