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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, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	$ 81,806	$ 67,237
Unrealized Gains	19	372
Unrealized Losses	(30)	(583)
Accrued Interest	261	83
Estimated Fair Value	82,056	67,109
Cash & Cash Equivalents	57,120	42,037	$ 38,994	$ 24,459
Investment Securities	24,936	25,072
Cash [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	56,886	38,276
Estimated Fair Value	56,886	38,276
Cash & Cash Equivalents	56,886	38,276
Fair Value, Inputs, Level 1 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	2,895	20,172
Unrealized Gains	2	308
Unrealized Losses	(2)	(539)
Accrued Interest	4	17
Estimated Fair Value	2,899	19,958
Cash & Cash Equivalents	234	3,761
Investment Securities	2,665	16,197
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	234	3,761
Estimated Fair Value	234	3,761
Cash & Cash Equivalents	234	3,761
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		9,654
Unrealized Gains		37
Unrealized Losses		(444)
Estimated Fair Value		9,247
Investment Securities		9,247
Fair Value, Inputs, Level 1 [Member] | Corporate Equity Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		1,332
Unrealized Gains		246
Unrealized Losses		(76)
Estimated Fair Value		1,502
Investment Securities		1,502
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	2,661	5,425
Unrealized Gains	2	25
Unrealized Losses	(2)	(19)
Accrued Interest	4	17
Estimated Fair Value	2,665	5,448
Investment Securities	2,665	5,448
Fair Value, Inputs, Level 2 [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	22,025	8,789
Unrealized Gains	17	64
Unrealized Losses	(28)	(44)
Accrued Interest	257	66
Estimated Fair Value	22,271	8,875
Investment Securities	22,271	8,875
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost	22,025	2,735
Unrealized Gains	17	42
Unrealized Losses	(28)	(3)
Accrued Interest	257	20
Estimated Fair Value	22,271	2,794
Investment Securities	$ 22,271	2,794
Fair Value, Inputs, Level 2 [Member] | Corporate Bonds
Cash and Cash Equivalents and Marketable Securities [Line Items]
Cost		6,054
Unrealized Gains		22
Unrealized Losses		(41)
Accrued Interest		46
Estimated Fair Value		6,081
Investment Securities		$ 6,081

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