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      <LongName>100980 - Disclosure - Quarterly Results for 2014 and 2013 - Summary of Quarterly Results for the Periods Presented (Detail)</LongName>
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      <LongName>101010 - Disclosure - Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail)</LongName>
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    <Log type="Info">Columns in Cash Flows statement 'CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)' have maximum duration 365 days and at least 59 values. Shorter duration columns must have at least one fourth (14) as many values. Column '7/1/2014 - 9/30/2014' is shorter (91 days) and has only 1 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)' have maximum duration 365 days and at least 59 values. Shorter duration columns must have at least one fourth (14) as many values. Column '10/1/2014 - 12/31/2014' is shorter (91 days) and has only 2 values, so it is being removed.</Log>
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    <Log type="Info">Columns in Cash Flows statement 'Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)' have maximum duration 365 days and at least 70 values. Shorter duration columns must have at least one fourth (17) as many values. Column '4/1/2013 - 6/30/2013' is shorter (90 days) and has only 1 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)' have maximum duration 365 days and at least 70 values. Shorter duration columns must have at least one fourth (17) as many values. Column '7/1/2013 - 9/30/2013' is shorter (91 days) and has only 1 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)' have maximum duration 365 days and at least 70 values. Shorter duration columns must have at least one fourth (17) as many values. Column '10/1/2013 - 12/31/2013' is shorter (91 days) and has only 3 values, so it is being removed.</Log>
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    <Log type="Info">Columns in Cash Flows statement 'Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)' have maximum duration 365 days and at least 70 values. Shorter duration columns must have at least one fourth (17) as many values. Column '4/1/2014 - 6/30/2014' is shorter (90 days) and has only 1 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)' have maximum duration 365 days and at least 70 values. Shorter duration columns must have at least one fourth (17) as many values. Column '7/1/2014 - 9/30/2014' is shorter (91 days) and has only 1 values, so it is being removed.</Log>
    <Log type="Info">Columns in Cash Flows statement 'Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) (USD $)' have maximum duration 365 days and at least 70 values. Shorter duration columns must have at least one fourth (17) as many values. Column '10/1/2014 - 12/31/2014' is shorter (91 days) and has only 3 values, so it is being removed.</Log>
    <Log type="Info">Process Flow-Through: 100010 - Statement - CONSOLIDATED BALANCE SHEETS</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2011'</Log>
    <Log type="Info">Process Flow-Through: 100020 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 100030 - Statement - CONSOLIDATED STATEMENTS OF INCOME</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2012'</Log>
    <Log type="Info">Process Flow-Through: 100040 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2014'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2013'</Log>
    <Log type="Info">Process Flow-Through: 100060 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2011'</Log>
    <Log type="Info">Process Flow-Through: 100070 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</Log>
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