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Accounting Policies (Comparison of Reported Condensed Consolidated Statement of Cash Flows to the Pro-forma Amounts had the Previous U.S. GAAP Guidance been in Effect) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash Flows from Operating Activities: |  |
Net income | $ 89,476 | $ 69,058
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Benefit of deferred income taxes | 3,005 | 1,941
Net cash provided by operating activities | 34,898 | $ 31,274
Accounting Standards Update 2014-09 [Member] |  |
Cash Flows from Operating Activities: |  |
Net income | 89,476 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Benefit of deferred income taxes | 3,005 |
All other adjustments to reconcile net income to net cash provided by operating activities | 27,855 |
Changes in assets and liabilities, net | (85,438) |
Net cash provided by operating activities | 34,898 |
Attributed to the New Revenue Standard [Member] | Accounting Standards Update 2014-09 [Member] |  |
Cash Flows from Operating Activities: |  |
Net income | 4,539 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Benefit of deferred income taxes | 1,917 |
Changes in assets and liabilities, net | (6,456) |
Previous U.S. GAAP (Reported) [Member] | Accounting Standards Update 2014-09 [Member] |  |
Cash Flows from Operating Activities: |  |
Net income | 84,937 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Benefit of deferred income taxes | 1,088 |
All other adjustments to reconcile net income to net cash provided by operating activities | 27,855 |
Changes in assets and liabilities, net | (78,982) |
Net cash provided by operating activities | $ 34,898 |

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