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Restatement of Previously Issued Condensed Consolidated Financial Statements - Impact on Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net income	$ 8,522	$ 8,902	[1]	$ 519	$ 3,074	[1]
Unrealized gains (losses) on marketable securities, net of tax	20	(17)	[1]	54	27	[1]
Comprehensive income	$ 8,542	8,885	[1]	$ 573	3,101	[1]
As Previously Reported [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net income		8,746			2,944
Unrealized gains (losses) on marketable securities, net of tax		(17)			27
Comprehensive income		8,729			2,971
Restatement Adjustments [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net income		156			130
Unrealized gains (losses) on marketable securities, net of tax		0			0
Comprehensive income		$ 156			$ 130
[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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