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Common Stock - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Schedule Of Common Stock [Line Items] |  |  |
Senior leverage ratio | 3.0 |  |
Share repurchase program, description | Under our credit facility, (described in Note 8, Debt and Financing Arrangements) share repurchases are unlimited when total leverage is less than 3.0. When leverage is greater than 3.0, the annual share repurchase is limited to $25 million |  |
Cost of shares repurchased to settle statutory employee withholding related to vesting of stock awards | $ 19,735,000 | $ 9,144,000 | $ 36,482,000
Share Repurchase Program [Member] |  |  |
Schedule Of Common Stock [Line Items] |  |  |
Stock repurchase program authorized to be repurchased | shares | 1,200,000 | 800,000 |
Payment for acquisition of treasury stock | $ 18,300,000 | $ 7,800,000 |
Shares repurchased to settle statutory employee withholding related to vesting of stock awards | shares | 100,000 |  |
Cost of shares repurchased to settle statutory employee withholding related to vesting of stock awards |  | $ 1,400,000 |
Maximum [Member] |  |  |
Schedule Of Common Stock [Line Items] |  |  |
Annual share repurchase limit | $ 25,000,000 |  |

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