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Summary of Financial Statement Affected by Application of ASU 2014-09 and Related Amendments (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Product revenues | $ 258,939 | $ 235,853 | $ 784,607 | $ 728,498 |
Type of Revenue [Extensible List] | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember | us-gaap:ProductMember |
Income tax expense (benefit) | $ 3,688 | $ 630 | $ 9,807 | $ 10,233 |
Net income (loss) | $ (355) | $ 6,554 | $ 29,270 | $ 40,469 |
Basic earnings (loss) per share | $ (0.01) | $ 0.18 | $ 0.80 | $ 1.10 |
Diluted earnings (loss) per share | $ (0.01) | $ 0.18 | $ 0.80 | $ 1.10 |
Balance Sheet September 30, 2018 |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 183,476 |  | $ 183,476 |  | $ 185,058
Accrued liabilities | 72,544 |  | 72,544 |  | 77,209
Unearned revenue | 6,128 |  | 6,128 |  | 4,889
Deferred income taxes, net | 69,750 |  | 69,750 |  |
Accumulated earnings | 351,336 |  | 351,336 |  | $ 293,645
Revenue Based on Previously Effective Guidance |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Product revenues | $ 258,184 |  | $ 782,451 |  |
Type of Revenue [Extensible List] | us-gaap:ProductMember |  | us-gaap:ProductMember |  |
Income tax expense (benefit) | $ 3,842 |  | $ 10,247 |  |
Net income (loss) | $ (956) |  | $ 27,554 |  |
Basic earnings (loss) per share | $ (0.03) |  | $ 0.76 |  |
Diluted earnings (loss) per share | $ (0.03) |  | $ 0.76 |  |
Balance Sheet September 30, 2018 |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 183,476 |  | $ 183,476 |  |
Accrued liabilities | 70,630 |  | 70,630 |  |
Unearned revenue | 4,214 |  | 4,214 |  |
Deferred income taxes, net | 69,360 |  | 69,360 |  |
Accumulated earnings | 352,860 |  | 352,860 |  |
ASU 2014-09 | New Revenue Standard Adjustment |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Product revenues | $ 755 |  | $ 2,156 |  |
Type of Revenue [Extensible List] | us-gaap:ProductMember |  | us-gaap:ProductMember |  |
Income tax expense (benefit) | $ (154) |  | $ (440) |  |
Net income (loss) | $ 601 |  | $ 1,716 |  |
Basic earnings (loss) per share | $ 0.02 |  | $ 0.04 |  |
Diluted earnings (loss) per share | $ 0.02 |  | $ 0.04 |  |
Balance Sheet September 30, 2018 |  |  |  |  |
Accrued liabilities | $ 1,914 |  | $ 1,914 |  |
Unearned revenue | 1,914 |  | 1,914 |  |
Deferred income taxes, net | 390 |  | 390 |  |
Accumulated earnings | $ (1,524) |  | $ (1,524) |  |

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