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Stock-Based Awards - Summary of Options and Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options, beginning balance	1,544,597	5,330,070	7,844,691
Options, Granted	0	0	0
Options, Forfeitures/expirations	0	0	0
Options, Exercised	(176,350)	(3,785,473)	(2,514,621)
Options, ending balance	1,368,247	1,544,597	5,330,070
Weighted Average Exercise Price of Options, beginning balance	$ 2.62	$ 1.61	$ 1.29
Weighted Average Exercise Price of Options, Granted	0	0	0
Weighted Average Exercise Price of Options, Forfeitures or expirations	0	0	0
Weighted Average Exercise Price of Options, Exercised	1.11	1.19	0.61
Weighted Average Exercise Price of Options, ending balance	$ 2.82	$ 2.62	$ 1.61

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)-(4)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price of options that were either forfeited or expired.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(iv)(3)-(4)
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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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