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Summary of Quarterly Financial Data (Unaudited) - Consolidated Statements of Income by Quarter (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 2,667,939 | $ 2,505,701 | $ 2,405,746 | $ 2,287,822 | $ 2,556,913 | $ 2,557,928 | $ 2,382,312 | $ 2,234,626 | $ 9,867,208 | $ 9,731,779 | $ 9,624,299
Gross profit | 384,090 | 362,622 | 360,618 | 350,346 | 371,734 | 359,085 | 353,305 | 345,150 | 1,457,676 | 1,429,274 | 1,414,612
Net income (loss) | $ 61,952 | $ 19,440 | $ 12,132 | $ (541) | $ 37,636 | $ 18,111 | $ 22,822 | $ 14,624 | $ 92,983 | $ 93,193 | $ 86,311
Earnings (loss) per common share - Basic | $ 1.43 | $ 0.45 | $ 0.27 | $ (0.01) | $ 0.84 | $ 0.40 | $ 0.50 | $ 0.31 | $ 2.11 | $ 2.04 | $ 1.71
Earnings (loss) per common share - Diluted | $ 1.42 | $ 0.44 | $ 0.27 | $ (0.01) | $ 0.83 | $ 0.40 | $ 0.50 | $ 0.31 | $ 2.09 | $ 2.03 | $ 1.70

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