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Quarterly Results of Operations (Unaudited) - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) Acquisition | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Interim Reporting [Line Items] |  |  |  |  |
Merger and acquisition related costs before tax |  | $ 1,500 | $ 8,400 | $ 11,682 | $ 9,248
Merger and acquisition related costs after tax |  | $ 3,200 | 7,300 |  |
Debt issuance Cost Write Off Before Tax |  |  | 3,000 |  |
Debt issuance Cost Write Off After Tax |  |  | $ 1,900 |  |
Number Of business acquisitions closed | Acquisition |  |  | 4 |  |
PEP [Member] |  |  |  |  |
Interim Reporting [Line Items] |  |  |  |  |
Merger and acquisition related costs before tax | $ 18,700 |  |  |  |
Merger and acquisition related costs after tax | 11,600 |  |  |  |
Debt issuance Cost Write Off Before Tax | 18,700 |  |  |  |
Debt issuance Cost Write Off After Tax | $ 12,000 |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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