Subsequent Events - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Oct. 28, 2014 Subsequent Event Private Placement	Oct. 17, 2014 GRSA Acquisition Subsequent Event	Oct. 17, 2014 GRSA Acquisition Subsequent Event Maximum	Oct. 17, 2014 GRSA Acquisition Subsequent Event Secured Bridge Term Loan Maximum	Oct. 17, 2014 GRSA Acquisition Subsequent Event Common Stock Maximum	Oct. 17, 2014 GRSA Acquisition Subsequent Event Preferred Stock
Subsequent Event [Line Items]
Business acquisition, purchase price				$ 525,000,000
Purchase price, initial cash payment				495,000,000
Purchase price, non-participating preferred stock				30,000,000
Business acquisition, termination fee				26,300,000
Anticipated transaction closure date				Jan. 31, 2015
Business acquisition, cash consideration				45,000,000
Net proceeds of common stock, shares					3,700,000
Common stock warrant consideration	48,000	60,000		125,000,000
Net proceeds from private placement securities					300,000,000
Committed asset-based lending facility				70,000,000
Commitment of purchase agreement						50,000,000	45,000,000	30,000,000
Number of shares issued			300,000
Sale of stock, price per share			$ 10.00
Proceeds from issuance of private placement			$ 3,000,000