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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Cash Flows from Operating Activities: |  |  |  |
Net income | $ 108,680 | $ 85,407 | $ 198,156 | $ 154,465
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Benefit of deferred income taxes |  |  | 8,638 | 2,691
Net cash provided by operating activities |  |  | 153,728 | $ 141,466
Accounting Standards Update 2014-09 |  |  |  |
Cash Flows from Operating Activities: |  |  |  |
Net income | 108,680 |  | 198,156 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Benefit of deferred income taxes |  |  | 8,638 |
All other adjustments to reconcile net income to net cash provided by operating activities |  |  | 55,661 |
Changes in assets and liabilities, net |  |  | (108,727) |
Net cash provided by operating activities |  |  | 153,728 |
Previous U.S. GAAP | Accounting Standards Update 2014-09 |  |  |  |
Cash Flows from Operating Activities: |  |  |  |
Net income | 103,940 |  | 188,877 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Benefit of deferred income taxes |  |  | 6,218 |
All other adjustments to reconcile net income to net cash provided by operating activities |  |  | 55,661 |
Changes in assets and liabilities, net |  |  | (97,028) |
Net cash provided by operating activities |  |  | 153,728 |
Attributed to the New Revenue Standard | Accounting Standards Update 2014-09 |  |  |  |
Cash Flows from Operating Activities: |  |  |  |
Net income | $ 4,740 |  | 9,279 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Benefit of deferred income taxes |  |  | 2,420 |
All other adjustments to reconcile net income to net cash provided by operating activities |  |  | 0 |
Changes in assets and liabilities, net |  |  | (11,699) |
Net cash provided by operating activities |  |  | $ 0 |

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