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Quarterly Financial Information (Unaudited) - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 345,175 | $ 264,724 | $ 298,778 | $ 276,042 | $ 319,775 | $ 271,720 | $ 296,215 | $ 261,497 | $ 1,184,719 | $ 1,149,207 | $ 1,092,124
Depreciation and amortization | 28,097 | 28,546 | 27,679 | 27,637 | 27,928 | 26,706 | 26,409 | 28,773 | 111,959 | 109,816 | 114,383
Operating income | 36,490 | 36,409 | 64,693 | 47,060 | 61,499 | 46,567 | 66,945 | 38,794 | 184,652 | 213,805 | 162,062
Income before income taxes | 21,141 | 24,400 | 48,191 | 33,213 | 49,144 | 35,415 | 52,746 | 25,461 | 126,945 | 162,766 | 99,656
(Provision) benefit for income taxes | 51,177 | (530) | (899) | (593) | (1,048) | (1,822) | (1,415) | 885 | 49,155 | (3,400) | 11,855
Net income | $ 72,318 | $ 23,870 | $ 47,292 | $ 32,620 | $ 48,096 | $ 33,593 | $ 51,331 | $ 26,346 | $ 176,100 | $ 159,366 | $ 111,511
Net income per share | $ 1.41 | $ 0.47 | $ 0.92 | $ 0.64 | $ 0.94 | $ 0.66 | $ 1.01 | $ 0.52 | $ 3.44 | $ 3.12 | $ 2.18
Net income per share - assuming dilution | $ 1.41 | $ 0.46 | $ 0.92 | $ 0.63 | $ 0.94 | $ 0.66 | $ 1.00 | $ 0.51 | $ 3.43 | $ 3.11 | $ 2.16

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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