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Summary of All Restricted Stock Activity (Detail) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding at December 31, 2015	1,538,116
Granted, Number of shares	1,105,010	667,126	572,052
Vested, Number of shares	(618,145)
Forfeited, Number of shares	(61,256)
Options Outstanding at December 31, 2016	1,963,725	1,538,116
Options Outstanding, Weighted Average Grant Date Fair Value	$ 13.25
Granted, Weighted Average Grant Date Fair Value	13.26
Vested, Weighted Average Grant Date Fair Value	9.91
Forfeited, Weighted Average Grant Date Fair Value	14.36
Options Outstanding, Weighted Average Grant Date Fair Value	$ 14.20	$ 13.25

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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=6415400&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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