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New Accounting Pronouncements - Summary of Cumulative Effect of Changes Made to Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable, net | $ 234,906 |  | $ 188,300
Other current assets | 188,931 |  |
Other non-current assets | 766,019 |  |
Total assets | 1,189,856 |  | 1,176,231
Accounts payable | 57,764 |  | 51,375
Accrued personnel costs | 55,038 |  | 45,264
Other current liabilities | 168,995 |  |
Deferred income taxes, net | 5,636 |  | 3,339
Other non-current liabilities | 300,508 |  |
Total liabilities | 587,941 |  | 645,352
Retained earnings | 409,467 |  | 345,302
Other stockholders' equity | 192,448 |  |
Total stockholders’ equity | 601,915 |  | 530,879
Total liabilities and stockholders’ equity | $ 1,189,856 |  | 1,176,231
Previously Reported [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable, net |  |  | 188,300
Other current assets |  |  | 259,873
Other non-current assets |  |  | 728,058
Total assets |  |  | 1,176,231
Accounts payable |  |  | 51,375
Accrued personnel costs |  |  | 45,264
Other current liabilities |  |  | 237,607
Deferred income taxes, net |  |  | 3,339
Other non-current liabilities |  |  | 307,767
Total liabilities |  |  | 645,352
Retained earnings |  |  | 345,302
Other stockholders' equity |  |  | 185,577
Total stockholders’ equity |  |  | 530,879
Total liabilities and stockholders’ equity |  |  | 1,176,231
Accounting Standards Update 2014-09 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable, net |  | $ 197,746 |
Other current assets |  | 259,953 |
Other non-current assets |  | 728,786 |
Total assets |  | 1,186,485 |
Accounts payable |  | 57,656 |
Accrued personnel costs |  | 45,859 |
Other current liabilities |  | 237,720 |
Deferred income taxes, net |  | 3,970 |
Other non-current liabilities |  | 308,779 |
Total liabilities |  | 653,984 |
Retained earnings |  | 346,924 |
Other stockholders' equity |  | 185,577 |
Total stockholders’ equity |  | 532,501 | $ 532,501
Total liabilities and stockholders’ equity |  | 1,186,485 |
Accounting Standards Update 2014-09 [Member] | Adjustments [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable, net |  | 9,446 |
Other current assets |  | 80 |
Other non-current assets |  | 728 |
Total assets |  | 10,254 |
Accounts payable |  | 6,281 |
Accrued personnel costs |  | 595 |
Other current liabilities |  | 113 |
Deferred income taxes, net |  | 631 |
Other non-current liabilities |  | 1,012 |
Total liabilities |  | 8,632 |
Retained earnings |  | 1,622 |
Total stockholders’ equity |  | 1,622 |
Total liabilities and stockholders’ equity |  | $ 10,254 |

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