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Financial Instruments (Cash and Available for Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Value by Significant Investment Category) (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 103,374	$ 98,823
Unrealized Losses	(364)	(268)
Accrued Interest	209	279
Estimated Fair Value	103,219	98,834
Cash & Cash Equivalents	82,307	75,077	$ 70,553	$ 52,436
Investment Securities	20,912	23,757
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	22,841	28,630
Estimated Fair Value	22,841	28,630
Cash & Cash Equivalents	22,841	28,630
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	63,601	51,789
Unrealized Losses	(116)	(67)
Accrued Interest	24	13
Estimated Fair Value	63,509	51,735
Cash & Cash Equivalents	59,466	46,447
Investment Securities	4,043	5,288
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	55,000	45,000
Estimated Fair Value	55,000	45,000
Cash & Cash Equivalents	55,000	45,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	4,466	1,447
Estimated Fair Value	4,466	1,447
Cash & Cash Equivalents	4,466	1,447
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	4,135	5,342
Unrealized Losses	(116)	(67)
Accrued Interest	24	13
Estimated Fair Value	4,043	5,288
Investment Securities	4,043	5,288
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	16,932	18,404
Unrealized Losses	(248)	(201)
Accrued Interest	185	266
Estimated Fair Value	16,869	18,469
Investment Securities	$ 16,869	$ 18,469

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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