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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	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 109,356	$ 98,823
Unrealized Losses	(337)	(268)
Accrued Interest	222	279
Estimated Fair Value	109,241	98,834
Cash & Cash Equivalents	86,963	75,077	$ 53,970	$ 52,436
Investment Securities	22,278	23,757
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	39,005	28,630
Estimated Fair Value	39,005	28,630
Cash & Cash Equivalents	39,005	28,630
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	52,094	51,789
Unrealized Losses	(97)	(67)
Accrued Interest	17	13
Estimated Fair Value	52,014	51,735
Cash & Cash Equivalents	47,958	46,447
Investment Securities	4,056	5,288
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	45,000	45,000
Estimated Fair Value	45,000	45,000
Cash & Cash Equivalents	45,000	45,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	2,958	1,447
Estimated Fair Value	2,958	1,447
Cash & Cash Equivalents	2,958	1,447
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	4,136	5,342
Unrealized Losses	(97)	(67)
Accrued Interest	17	13
Estimated Fair Value	4,056	5,288
Investment Securities	4,056	5,288
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	18,257	18,404
Unrealized Losses	(240)	(201)
Accrued Interest	205	266
Estimated Fair Value	18,222	18,469
Investment Securities	$ 18,222	$ 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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