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Restatement of Previously Issued Financial Statements - Impact on Consolidated Statements of Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net (loss) income	$ 11,447	$ 10,973	$ 8,902	$ (5,828)	$ 8,653	$ 8,866	$ (39,782)	$ (3,283)	$ 4,630	$ 8,725	$ 5,519	$ (3,201)	$ 25,494	$ (25,546)	[1]	$ 15,673	[1]
Unrealized gains (losses) on marketable securities, net of tax													(8)	3	[1]	(49)	[1]
Comprehensive (loss) income													$ 25,486	(25,543)	[1]	15,624	[1]
As Previously Reported [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net (loss) income			8,746	(5,802)	7,034	(37,818)	7,283	(3,583)	5,561	8,994	5,886	(2,549)		(27,084)		17,892
Unrealized gains (losses) on marketable securities, net of tax														3		(49)
Comprehensive (loss) income														(27,081)		17,843
Prior Period Adjustments [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net (loss) income			$ 156	$ (26)	$ 1,619	$ 46,684	$ (47,065)	$ 300	$ (931)	$ (269)	$ (367)	$ (652)		1,538		(2,219)
Prior Period Adjustments [Member] | Unsupported Non-GAAP Journal Entry Corrections [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net (loss) income														1,728		(1,804)
Unrealized gains (losses) on marketable securities, net of tax														0		0
Comprehensive (loss) income														1,728		(1,804)
Prior Period Adjustments [Member] | Workers' Compensation Corrections [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net (loss) income														(444)		(430)
Unrealized gains (losses) on marketable securities, net of tax														0		0
Comprehensive (loss) income														(444)		(430)
Prior Period Adjustments [Member] | Payroll Tax Corrections [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net (loss) income														254		15
Unrealized gains (losses) on marketable securities, net of tax														0		0
Comprehensive (loss) income														$ 254		$ 15
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831270

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831223

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=51831255

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831270

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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