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Quarterly Operating Results (Unaudited) - Quarterly Operating Results (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 393,020 us-gaap_Revenues | $ 421,418 us-gaap_Revenues | $ 397,764 us-gaap_Revenues | $ 363,594 us-gaap_Revenues | $ 343,165 us-gaap_Revenues | $ 359,310 us-gaap_Revenues | $ 325,792 us-gaap_Revenues | $ 335,012 us-gaap_Revenues | $ 1,575,796 us-gaap_Revenues | $ 1,363,279 us-gaap_Revenues | $ 1,200,032 us-gaap_Revenues
Total expenses | 354,574 us-gaap_OperatingExpenses | 308,733 us-gaap_OperatingExpenses | 295,983 us-gaap_OperatingExpenses | 276,757 us-gaap_OperatingExpenses | 266,723 us-gaap_OperatingExpenses | 263,855 us-gaap_OperatingExpenses | 239,571 us-gaap_OperatingExpenses | 235,521 us-gaap_OperatingExpenses | 1,236,047 us-gaap_OperatingExpenses | 1,005,670 us-gaap_OperatingExpenses | 895,221 us-gaap_OperatingExpenses
Income before income taxes | 38,446 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 112,685 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 101,781 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 86,837 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 76,442 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 95,455 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 86,221 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 99,491 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 339,749 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 357,609 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 304,811 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income | $ 24,395 us-gaap_NetIncomeLoss | $ 68,331 us-gaap_NetIncomeLoss | $ 61,755 us-gaap_NetIncomeLoss | $ 52,415 us-gaap_NetIncomeLoss | $ 47,225 us-gaap_NetIncomeLoss | $ 57,749 us-gaap_NetIncomeLoss | $ 52,007 us-gaap_NetIncomeLoss | $ 60,131 us-gaap_NetIncomeLoss | $ 206,896 us-gaap_NetIncomeLoss | $ 217,112 us-gaap_NetIncomeLoss | $ 184,045 us-gaap_NetIncomeLoss
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 0.43 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 1.43 us-gaap_EarningsPerShareBasic | $ 1.50 us-gaap_EarningsPerShareBasic | $ 1.28 us-gaap_EarningsPerShareBasic
Diluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 1.41 us-gaap_EarningsPerShareDiluted | $ 1.48 us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted

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