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Summary of All Restricted Stock Activity (Detail) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares/Options Outstanding at December 31, 2016	1,963,725
Number of Shares, Granted	794,700	1,105,010	667,126
Number of Shares, Vested	(657,040)
Number of Shares, Forfeited	(255,758)
Number of Shares/Options Outstanding at December 31, 2017	1,845,627	1,963,725
Weighted Average Grant Date Fair Value (Exercise Price), Outstanding at December 31, 2016	$ 14.20
Weighted Average Grant Date Fair Value, Granted	21.65
Weighted Average Grant Date Fair Value, Vested	14.33
Weighted Average Grant Date Fair Value, Forfeited	16.58
Weighted Average Grant Date Fair Value (Exercise Price), Outstanding at December 31, 2017	$ 17.11	$ 14.20

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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.

+ 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)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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