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Restatement of Previously Issued Consolidated Financial Statements - Cumulative Restatement Adjustments Recorded on Accumulated Earnings (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2012
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings | $ 95,328 |  |  |  | $ 40,843 |  |  |  |
As Previously Reported [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  | $ 95,038 | $ 89,347 | $ 76,841 | 65,576 | $ 60,924 | $ 49,701 | $ 39,770 |
As Previously Reported [Member] | Accumulated Earnings [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  |  |  |  |  |  |  |  | $ 70,414
Other Insignificant Corrective Adjustments [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  | (13,085) | (24,117) | (23,591) | (23,061) | (21,676) | (21,600) | (21,166) |
Other Insignificant Corrective Adjustments [Member] | Accumulated Earnings [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  |  |  |  |  |  |  |  | (17,503)
Other Insignificant Corrective Adjustments [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  | (953) | (1,833) | (1,660) | (1,672) | (3,444) | (3,286) | (3,420) |
Other Insignificant Corrective Adjustments [Member] | Accumulated Earnings [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  |  |  |  |  |  |  |  | (3,359)
As Restated [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  | $ 81,000 | $ 63,397 | $ 51,590 | $ 40,843 | $ 35,804 | $ 24,815 | $ 15,184 |
As Restated [Member] | Accumulated Earnings [Member] |  |  |  |  |  |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |  |  |  |  |  |
Accumulated earnings |  |  |  |  |  |  |  |  | $ 49,552

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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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