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Summary of All Restricted Stock Activity (Detail) - Restricted Stock - $ / shares | 12 Months Ended
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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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- Definition 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 + Details
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