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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | $ 136,000 | $ 721,851 | $ 408,072
Other Payable | 10,028 | 1,904 | 552
Recorded Earn-Out Payable | 36,899 | 33,229 | 5,091
Net Assets Acquired | 182,927 | 756,984 | 413,715
Maximum Potential Earn- Out Payable | 73,074 | 49,462 | 16,768
Liberty Insurance Brokers, Inc. and Affiliates [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 14,981 |  |
Liberty Insurance Brokers, Inc. and Affiliates [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Feb. 01, 2015 |  |
Cash Paid | $ 12,000 |  |
Other Payable | 0 |  |
Recorded Earn-Out Payable | 2,981 |  |
Net Assets Acquired | 14,981 |  |
Maximum Potential Earn- Out Payable | 3,750 |  |
Wright Insurance Group Llc [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  | $ 610,654 |
Wright Insurance Group Llc [Member] | National Programs |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2014 |
Cash Paid |  | $ 609,183 |
Other Payable |  | 1,471 |
Recorded Earn-Out Payable |  | 0 |
Net Assets Acquired |  | 610,654 |
Maximum Potential Earn- Out Payable |  | 0 |
Wright Insurance Group Llc [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | $ 16,163
Wright Insurance Group Llc [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Jun. 01, 2013
Cash Paid |  |  | $ 13,792
Other Payable |  |  | 50
Recorded Earn-Out Payable |  |  | 2,321
Net Assets Acquired |  |  | 16,163
Maximum Potential Earn- Out Payable |  |  | 4,300
Beecher Carlson Holdings [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | $ 364,256
Beecher Carlson Holdings [Member] | Various |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Jul. 01, 2013
Cash Paid |  |  | $ 364,256
Other Payable |  |  | 0
Recorded Earn-Out Payable |  |  | 0
Net Assets Acquired |  |  | 364,256
Maximum Potential Earn- Out Payable |  |  | 0
Spain Agency, Inc. (Spain) |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 23,323 |  |
Spain Agency, Inc. (Spain) | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Mar. 01, 2015 |  |
Cash Paid | $ 20,706 |  |
Other Payable | 0 |  |
Recorded Earn-Out Payable | 2,617 |  |
Net Assets Acquired | 23,323 |  |
Maximum Potential Earn- Out Payable | 9,162 |  |
Bellingham Underwriters, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 12,829 |  |
Bellingham Underwriters, Inc. [Member] | National Programs |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | May 01, 2015 |  |
Bellingham Underwriters, Inc. [Member] | National Programs Divisions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | $ 9,007 |  |
Other Payable | 500 |  |
Recorded Earn-Out Payable | 3,322 |  |
Net Assets Acquired | 12,829 |  |
Maximum Potential Earn- Out Payable | 4,400 |  |
Fitness Insurance, LLC [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 11,834 |  |
Fitness Insurance, LLC [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Jun. 01, 2015 |  |
Cash Paid | $ 9,455 |  |
Other Payable | 0 |  |
Recorded Earn-Out Payable | 2,379 |  |
Net Assets Acquired | 11,834 |  |
Maximum Potential Earn- Out Payable | 3,500 |  |
Other |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 63,587 |  |
Other | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Jun. 01, 2015 |  |
Cash Paid | $ 49,600 |  |
Other Payable | 400 |  |
Recorded Earn-Out Payable | 13,587 |  |
Net Assets Acquired | 63,587 |  |
Maximum Potential Earn- Out Payable | 26,000 |  |
Bentrust Financial, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 10,852 |  |
Bentrust Financial, Inc. [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Dec. 01, 2015 |  |
Cash Paid | $ 10,142 |  |
Other Payable | 391 |  |
Recorded Earn-Out Payable | 319 |  |
Net Assets Acquired | 10,852 |  |
Maximum Potential Earn- Out Payable | 2,200 |  |
MBA Insurance Agency of Arizona, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 14,573 |  |
MBA Insurance Agency of Arizona, Inc. [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Dec. 01, 2015 |  |
Cash Paid | $ 68 |  |
Other Payable | 8,442 |  |
Recorded Earn-Out Payable | 6,063 |  |
Net Assets Acquired | 14,573 |  |
Maximum Potential Earn- Out Payable | 9,500 |  |
Smith Insurance, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | $ 13,343 |  |
Smith Insurance, Inc. [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | Dec. 01, 2015 |  |
Cash Paid | $ 12,096 |  |
Other Payable | 200 |  |
Recorded Earn-Out Payable | 1,047 |  |
Net Assets Acquired | 13,343 |  |
Maximum Potential Earn- Out Payable | 6,350 |  |
Other Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | 17,605 | 17,184 | 12,799
Other Acquisitions [Member] | Various |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | 12,926 |  | 10,254
Other Payable | 95 |  | 502
Recorded Earn-Out Payable | 4,584 |  | 2,043
Net Assets Acquired | 17,605 |  | 12,799
Maximum Potential Earn- Out Payable | $ 8,212 |  | 7,468
Pacific Resources Benefits Advisors [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  | $ 117,452 |
Pacific Resources Benefits Advisors [Member] | Retail |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2014 |
Cash Paid |  | $ 90,000 |
Other Payable |  | 0 |
Recorded Earn-Out Payable |  | 27,452 |
Net Assets Acquired |  | 117,452 |
Maximum Potential Earn- Out Payable |  | 35,000 |
Axia Strategies, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  | $ 11,694 |
Axia Strategies, Inc. [Member] | Wholesale Brokerage [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2014 |
Cash Paid |  | $ 9,870 |
Other Payable |  | 0 |
Recorded Earn-Out Payable |  | 1,824 |
Net Assets Acquired |  | 11,694 |
Maximum Potential Earn- Out Payable |  | 5,200 |
Various | Other Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid |  | 12,798 |
Other Payable |  | 433 |
Recorded Earn-Out Payable |  | 3,953 |
Net Assets Acquired |  | 17,184 |
Maximum Potential Earn- Out Payable |  | $ 9,262 |
ICA, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | $ 20,497
ICA, Inc. [Member] | Services [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Dec. 31, 2013
Cash Paid |  |  | $ 19,770
Other Payable |  |  | 0
Recorded Earn-Out Payable |  |  | 727
Net Assets Acquired |  |  | 20,497
Maximum Potential Earn- Out Payable |  |  | $ 5,000
Two Thousand Fourteen Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted |  | $ 1.49 | $ 1.70
Pro Forma Weighted Average Shares Outstanding, Diluted |  | 142,891 | 142,624
Two Thousand Fifteen Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted | $ 1.73 | $ 1.48 |
Pro Forma Weighted Average Shares Outstanding, Diluted | 140,112 | 142,891 |

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