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Summary Selected Quarterly Financial Data - Revised Consolidated Statements of Cash Flow (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
As Previously Reported [Member]
Jun. 30, 2013
As Previously Reported [Member]
Mar. 31, 2013
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
Sep. 30, 2012
As Previously Reported [Member]
Jun. 30, 2012
As Previously Reported [Member]
Mar. 31, 2012
As Previously Reported [Member]
Jun. 30, 2013
As Previously Reported [Member]
Jun. 30, 2012
As Previously Reported [Member]
Sep. 30, 2013
As Previously Reported [Member]
Sep. 30, 2012
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
Dec. 31, 2011
As Previously Reported [Member]
Sep. 30, 2013
Adjustments [Member]
Jun. 30, 2013
Adjustments [Member]
Mar. 31, 2013
Adjustments [Member]
Dec. 31, 2012
Adjustments [Member]
Sep. 30, 2012
Adjustments [Member]
Jun. 30, 2012
Adjustments [Member]
Mar. 31, 2012
Adjustments [Member]
Jun. 30, 2013
Adjustments [Member]
Jun. 30, 2012
Adjustments [Member]
Sep. 30, 2013
Adjustments [Member]
Sep. 30, 2012
Adjustments [Member]
Dec. 31, 2012
Adjustments [Member]
Dec. 31, 2011
Adjustments [Member]
Sep. 30, 2013
As Revised [Member]
Jun. 30, 2013
As Revised [Member]
Mar. 31, 2013
As Revised [Member]
Dec. 31, 2012
As Revised [Member]
Sep. 30, 2012
As Revised [Member]
Jun. 30, 2012
As Revised [Member]
Mar. 31, 2012
As Revised [Member]
Jun. 30, 2013
As Revised [Member]
Jun. 30, 2012
As Revised [Member]
Sep. 30, 2013
As Revised [Member]
Sep. 30, 2012
As Revised [Member]
Dec. 31, 2012
As Revised [Member]
Dec. 31, 2011
As Revised [Member]
Cash flows from operating activities:                                                                                                      
Net income $ 2,161 $ 2,509 $ 6,185 $ 2,169 $ 4,477 $ 11,111 $ 7,584 $ 3,124 $ 10,863 $ 13,024 $ 26,296 $ 21,991 $ 2,435 $ 5,622 $ 2,341 $ 4,251 $ 10,373 $ 7,769 $ 3,181 $ 7,963 $ 10,950 $ 10,789 $ 21,323 $ 25,574 $ 23,010 $ 74 $ 563 $ (172) $ 226 $ 738 $ (185) $ (57) $ 391 $ (242) $ 74 $ 496 $ 722 $ (1,019) $ 2,509 $ 6,185 $ 2,169 $ 4,477 $ 11,111 $ 7,584 $ 3,124 $ 8,354 $ 10,708 $ 10,863 $ 21,819 $ 26,296 $ 21,991
Net (gains) losses from investments   (600) (100) 100 100         2,433 (94) 399   51 51 739 (147)     102     (290) 449 (1,018)   (149) 149 65 (608)           (608) (543) 1,417   (98) 200 804 (755)     102     (898) (94) 399
Prepaid expenses and other current assets                 3,609 (607) (6,610) 8,484     1,271         4,619   3,683   6,279 (7,805)     (115)         260   (74)   331 (679)     1,156         4,879       6,610 (8,484)
Deferred revenue                   1,673 1,706 16,645     2,709         (12,955)       1,807 16,364     138         (651)       (101) 281     2,847         (13,606)       1,706 16,645
Net cash provided by operating activities                 $ 35,352 $ 30,713 $ 53,147 $ 55,444     $ 35,453         $ 37,231   $ 32,352                                     $ 35,453         $ 37,231