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Shareholders' Equity - Summary of Activities in Common Stock (Detail) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |
Issuance of shares pursuant to stock compensation plan, shares | 1,113 | 827 | 1,118
Purchases of common stock, Shares | (44) | (882) | (5)
Employee stock plan purchases, Shares | 51 | 47 | 43
Shares issued for acquisitions, Shares |  |  | 2,149
Issuance of shares pursuant to stock compensation plan | $ 49,845 | $ 23,527 | $ 23,160
Purchases of common stock, Amount | (6,613) | (112,699) | (645)
Employee stock plan purchases, Amount | $ 7,044 | $ 6,236 | 4,671
Shares issued for acquisitions, Amount |  |  | $ 364,333

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