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Notes Receivable - Summary of Activity in Loan Loss Reserve (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Balance at January 1	$ 15,106	$ 15,106	$ 10,806
Additions:
Loan loss reserve	500	0	4,300
Balance at December 31	$ 15,606	$ 15,106	$ 15,106

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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