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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Alert Labs Inc. | Peirce-Phelps, Inc. | Dunphey & Associates Supply Co., Inc. | N&S Supply of Fishkill, Inc | Common Stock, Class B Common Stock and Preferred Stock | Common Stock, Class B Common Stock and Preferred Stock Alert Labs Inc. | Common Stock, Class B Common Stock and Preferred Stock Peirce-Phelps, Inc. | Common Stock, Class B Common Stock and Preferred Stock Dunphey & Associates Supply Co., Inc. | Common Stock, Class B Common Stock and Preferred Stock N&S Supply of Fishkill, Inc | Paid-In Capital | Paid-In Capital Alert Labs Inc. | Paid-In Capital Peirce-Phelps, Inc. | Paid-In Capital Dunphey & Associates Supply Co., Inc. | Paid-In Capital N&S Supply of Fishkill, Inc | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Retained Earnings | Retained Earnings Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Treasury Stock | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 1,550,977 |  |  |  |  | $ 21,050 |  |  |  |  | $ 804,008 |  |  |  |  | $ (34,221) | $ 301 | $ 594,556 | $ (301) | $ (87,440) | $ 253,024
Beginning balance (in shares) at Dec. 31, 2017 |  |  |  |  |  | 37,228,715 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 296,529 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 242,932 |  |  | 53,597
Other comprehensive gain (loss) | (18,732) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,048) |  |  |  |  | (6,684)
Issuances of non-vested restricted shares of common stock |  |  |  |  |  | $ 71 |  |  |  |  | (71) |  |  |  |  |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  |  |  | 142,865 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  |  |  |  |  | $ (5) |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  |  |  |  |  | (10,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan | 2,945 |  |  |  |  | $ 9 |  |  |  |  | 2,936 |  |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  |  |  |  |  | 17,318 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 7,852 |  |  |  |  | $ 32 |  |  |  |  | 7,820 |  |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  |  |  | 64,423 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock | (5,044) |  |  |  |  | $ (14) |  |  |  |  | (5,030) |  |  |  |  |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  |  |  | (28,781) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 15,631 |  |  |  |  |  |  |  |  |  | 15,631 |  |  |  |  |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (209,218) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (209,218) |  |  |
Common stock issued |  | $ 6,846 |  |  |  |  | $ 24 |  |  |  |  | $ 6,822 |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  |  | 47,103 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated entity | 752 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 752
Distributions to non-controlling interest | (46,825) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (46,825)
Ending balance at Dec. 31, 2018 | 1,601,713 |  |  |  |  | $ 21,167 |  |  |  |  | 832,121 |  |  |  |  | (45,968) |  | 627,969 |  | (87,440) | 253,864
Ending balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 37,461,643 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 295,775 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 245,950 |  |  | 49,825
Other comprehensive gain (loss) | 10,485 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,918 |  |  |  |  | 3,567
Issuances of non-vested restricted shares of common stock |  |  |  |  |  | $ 87 |  |  |  |  | (87) |  |  |  |  |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  |  |  | 173,940 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  |  |  |  |  | $ (7) |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  |  |  |  |  | (12,837) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan | 4,274 |  |  |  |  | $ 15 |  |  |  |  | 4,259 |  |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  |  |  |  |  | 30,715 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 13,464 |  |  |  |  | $ 53 |  |  |  |  | 13,411 |  |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  |  |  | 105,288 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock | (1,652) |  |  |  |  | $ (5) |  |  |  |  | (1,647) |  |  |  |  |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  |  |  | (10,623) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 16,537 |  |  |  |  |  |  |  |  |  | 16,537 |  |  |  |  |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (241,412) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (241,412) |  |  |
Common stock issued |  |  | $ 58,344 | $ 6,891 | $ 4,032 |  |  | $ 186 | $ 25 | $ 12 |  |  | $ 58,158 | $ 6,866 | $ 4,020 |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  |  |  | 372,543 | 50,952 | 22,435 |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated entity | 988 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 988
Decrease in non-controlling interest in Carrier Enterprise II | (32,400) |  |  |  |  |  |  |  |  |  | (25,768) |  |  |  |  |  |  |  |  |  | (6,632)
Distributions to non-controlling interest | (39,272) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (39,272)
Investment in Peirce-Phelps, Inc. | 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,000
Ending balance at Dec. 31, 2019 | 1,714,767 |  |  |  |  | $ 21,533 |  |  |  |  | 907,877 |  |  |  |  | (39,050) |  | 632,507 |  | (87,440) | 279,340
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  |  | 38,194,056 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 323,172 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 269,579 |  |  | 53,593
Other comprehensive gain (loss) | 6,734 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,183 |  |  |  |  | 2,551
Issuances of non-vested restricted shares of common stock |  |  |  |  |  | $ 92 |  |  |  |  | (92) |  |  |  |  |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  |  |  | 184,265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  |  |  |  |  | $ (2) |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  |  |  |  |  | (3,589) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan | 4,543 |  |  |  |  | $ 13 |  |  |  |  | 4,530 |  |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  |  |  |  |  | 25,216 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 21,600 |  |  |  |  | $ 72 |  |  |  |  | 21,528 |  |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  |  |  | 144,894 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement of common stock | (4,642) |  |  |  |  | $ (11) |  |  |  |  | (4,631) |  |  |  |  |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  |  |  | (23,148) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation | 21,862 |  |  |  |  |  |  |  |  |  | 21,862 |  |  |  |  |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (265,713) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (265,713) |  |  |
Distributions to non-controlling interest | (42,401) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (42,401)
Adjustment to fair value of Common stock issued for N&S Supply of Fishkill, Inc. |  |  |  |  | $ (161) |  |  |  |  |  |  |  |  |  | $ (161) |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,779,761 |  |  |  |  | $ 21,697 |  |  |  |  | $ 950,915 |  |  |  |  | $ (34,867) |  | $ 636,373 |  | $ (87,440) | $ 293,083
Ending balance (in shares) at Dec. 31, 2020 |  |  |  |  |  | 38,521,694 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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