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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 319,775 | $ 271,720 | $ 296,215 | $ 261,497 | $ 312,120 | $ 252,820 | $ 274,036 | $ 253,148 | $ 1,149,207 | $ 1,092,124 | $ 1,040,991
Depreciation and amortization | 27,928 | 26,706 | 26,409 | 28,773 | 28,916 | 28,498 | 28,399 | 28,570 | 109,816 | 114,383 | 112,278
Operating income | 61,499 | 46,567 | 66,945 | 38,794 | 36,389 | 32,768 | 57,015 | 35,890 | 213,805 | 162,062 | 153,105
Income before income taxes | 49,144 | 35,415 | 52,746 | 25,461 | 30,469 | 22,079 | 42,255 | 4,853 | 162,766 | 99,656 | 124,985
(Provision) benefit for income taxes | (1,048) | (1,822) | (1,415) | 885 | 8,430 | 4,612 | (866) | (321) | (3,400) | 11,855 | 1,467
Net income | 48,096 | 33,593 | 51,331 | 26,346 | 38,899 | 26,691 | 41,389 | 4,532 | 159,366 | 111,511 | 126,452
Net income available to common stockholders | $ 48,096 | $ 33,593 | $ 51,331 | $ 26,346 | $ 38,899 | $ 26,691 | $ 41,389 | $ 4,532 | $ 159,366 | $ 111,511 | $ 121,035
Net income per share | $ 0.94 | $ 0.66 | $ 1.01 | $ 0.52 | $ 0.76 | $ 0.52 | $ 0.81 | $ 0.09 | $ 3.12 | $ 2.18 | $ 2.38
Net income per share - assuming dilution | $ 0.94 | $ 0.66 | $ 1.00 | $ 0.51 | $ 0.75 | $ 0.52 | $ 0.80 | $ 0.09 | $ 3.11 | $ 2.16 | $ 2.17

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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=66902209&loc=d3e3602-108585 + Details
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