Revolving Line of Credit - Chronology of Total Commitment Under Revolving Credit Facility with Associated Rate Options in Effect (Parenthetical) (Detail)	10 Months Ended	12 Months Ended	9 Months Ended
	Oct. 31, 2011	Dec. 31, 2012	Sep. 30, 2013 London Interbank Offered Rate (LIBOR) [Member]	Sep. 30, 2013 Federal Funds [Member]	Sep. 30, 2013 Base Rate [Member]
Credit Facilities [Line Items]
The base rate established by the Agent			1.00%	0.50%
Rate options	Prime plus 0.75% or LIBOR plus 2.75%	Base plus 0.75% or LIBOR plus 2.50%			The "base rate" is the highest of the prime rate established by the Agent, or one-month LIBOR plus 1%, or the federal funds effective rate plus 0.5%.