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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, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 78,852	$ 76,927
Unrealized Losses	(170)	(396)
Accrued Interest	277	317
Estimated Fair Value	78,959	76,848
Cash & Cash Equivalents	53,970	52,436	$ 47,316	$ 42,037
Investment Securities	24,989	24,412
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	33,840	52,005
Estimated Fair Value	33,840	52,005
Cash & Cash Equivalents	33,840	52,005
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	22,779	3,086
Unrealized Losses	(45)	(48)
Accrued Interest	4	9
Estimated Fair Value	22,738	3,047
Cash & Cash Equivalents	20,130	431
Investment Securities	2,608	2,616
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	20,000
Estimated Fair Value	20,000
Cash & Cash Equivalents	20,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	130	431
Estimated Fair Value	130	431
Cash & Cash Equivalents	130	431
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	2,649	2,655
Unrealized Losses	(45)	(48)
Accrued Interest	4	9
Estimated Fair Value	2,608	2,616
Investment Securities	2,608	2,616
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	22,233	21,836
Unrealized Losses	(125)	(348)
Accrued Interest	273	308
Estimated Fair Value	22,381	21,796
Investment Securities	$ 22,381	$ 21,796

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

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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