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Shares Repurchased - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 29, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchased common stock, value | $ 24,116,000 | $ 6,531,000 | $ 1,613,000 |
Three-Year Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock purchase authorized amount |  |  |  | $ 100,000,000
Repurchased common stock, shares | 1,190 |  |  |
Repurchased common stock, value | $ 24,116,000 |  |  |
Repurchased shares, remaining for future purchases | $ 75,884,000 |  |  |
Three-Year Share Repurchase Program [Member] | Tax Withholding Obligations [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Repurchased common stock, shares |  | 416 | 137 |
Repurchased common stock, value |  | $ 6,531,000 | $ 1,613,000 |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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