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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Product revenues | $ 263,779 | $ 243,378 | $ 525,668 | $ 492,645 |
Income tax expense | 3,083 | 2,371 | 6,119 | 9,603 |
Net income | $ 16,659 | $ 8,513 | $ 29,625 | $ 33,915 |
Basic earnings per share | $ 0.46 | $ 0.23 | $ 0.81 | $ 0.92 |
Diluted earnings per share | $ 0.45 | $ 0.23 | $ 0.81 | $ 0.92 |
Balance Sheet June 30, 2018 |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 200,024 |  | $ 200,024 |  | $ 185,058
Accrued liabilities | 72,781 |  | 72,781 |  | 77,209
Unearned revenue | 5,768 |  | 5,768 |  | 4,889
Deferred income taxes, net | 77,126 |  | 77,126 |  |
Accumulated earnings | 351,691 |  | 351,691 |  | $ 293,645
Revenue Based on Previously Effective Guidance |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Product revenues | 263,058 |  | 524,267 |  |
Income tax expense | 3,232 |  | 6,409 |  |
Net income | $ 16,087 |  | $ 28,514 |  |
Basic earnings per share | $ 0.44 |  | $ 0.78 |  |
Diluted earnings per share | $ 0.44 |  | $ 0.78 |  |
Balance Sheet June 30, 2018 |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 200,024 |  | $ 200,024 |  |
Accrued liabilities | 70,100 |  | 70,100 |  |
Unearned revenue | 3,087 |  | 3,087 |  |
Deferred income taxes, net | 76,578 |  | 76,578 |  |
Accumulated earnings | 353,824 |  | 353,824 |  |
ASU 2014-09 | New Revenue Standard Adjustment |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Product revenues | 721 |  | 1,401 |  |
Income tax expense | (149) |  | (290) |  |
Net income | $ 572 |  | $ 1,111 |  |
Basic earnings per share | $ 0.02 |  | $ 0.03 |  |
Diluted earnings per share | $ 0.02 |  | $ 0.03 |  |
Balance Sheet June 30, 2018 |  |  |  |  |
Accrued liabilities | $ 2,681 |  | $ 2,681 |  |
Unearned revenue | 2,681 |  | 2,681 |  |
Deferred income taxes, net | 548 |  | 548 |  |
Accumulated earnings | $ (2,133) |  | $ (2,133) |  |

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