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Stock-Based Compensation - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Number of Shares, Outstanding, Beginning Balance | shares | 170,815
Number of Shares, Exercised | shares | (51,936)
Number of Shares, Outstanding, Ending Balance | shares | 118,879
Number of Shares, Exercisable, Ending Balance | shares | 118,879
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ 14.84
Weighted Average Exercise Price, Exercised | 18.71
Weighted Average Exercise Price, Outstanding, Ending Balance | 16.23
Weighted Average Exercise Price, Exercisable, Ending Balance | $ 16.23
Aggregate Intrinsic Value, Outstanding | $ | $ 1,528
Aggregate Intrinsic Value, Exercisable | $ | $ 1,528
Weighted-average remaining contractual life, options exercisable | 4 years 7 months 6 days
Minimum [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Roll Forward] |
Option Price Per Share, Outstanding, Beginning Balance (in dollars per share) | $ 2.89
Option Price Per Share, Exercised (in dollars per share) | 2.89
Option Price Per Share, Outstanding, Ending Balance (in dollars per share) | 2.89
Option Price Per Share, Exercisable, Ending Balance (in dollars per share) | 2.89
Maximum [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Roll Forward] |
Option Price Per Share, Outstanding, Beginning Balance (in dollars per share) | 24.65
Option Price Per Share, Exercised (in dollars per share) | 24.65
Option Price Per Share, Outstanding, Ending Balance (in dollars per share) | 24.65
Option Price Per Share, Exercisable, Ending Balance (in dollars per share) | $ 24.65

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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