Organization and Summary of Significant Accounting Policies (Changes in Carrying Amount of Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Roll Forward]
Basis, Balance, beginning of period	$ 12,877	$ 12,877	$ 12,877
Basis, Changes in Goodwill	0	0	0
Basis, Balance, end of period	12,877	12,877	12,877
Accumulated Amortization, Balance, beginning of period	(1,073)	(1,073)	(1,073)
Accumulated Amortization, Changes in Goodwill	0	0	0
Accumulated Amortization, Balance, end of period	(1,073)	(1,073)	(1,073)
Impairment Write-Offs, Balance, beginning of period	(4,648)	(4,648)	(4,648)
Impairment Write-Offs, Changes in Goodwill	0	0	0
Impairment Write-Offs, Balance, end of period	(4,648)	(4,648)	(4,648)
Divestitures, Balance, beginning of period	(1,494)	0	0
Divestitures, Changes in Goodwill	0	(1,494)	0
Divestitures, Balance, end of period	(1,494)	(1,494)	0
Goodwill	5,662	5,662	7,156	7,156
Total, Changes in Goodwill	$ 0	$ (1,494)	$ 0