Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Commitments and Contingencies [Line Items]
Due from affiliate	$ 6,000,000		$ 6,000,000
Revolving Line Of Credit Expires In July 2013
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations	24,000,000
Loan Due May 2016
Commitments and Contingencies [Line Items]
Loan to affiliate		3,402,000
Loan to affiliate, due date	2016-05
Due from affiliate	$ 1,605,000		$ 2,984,000