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Interim Consolidated Financial Statements - Revised Consolidated Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 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
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
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, 2012
As Previously Reported [Member]
Dec. 31, 2012
As Previously Reported [Member]
Dec. 31, 2011
As Previously Reported [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, 2012
Adjustments [Member]
Dec. 31, 2012
Adjustments [Member]
Dec. 31, 2011
Adjustments [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, 2012
As Revised [Member]
Dec. 31, 2012
As Revised [Member]
Dec. 31, 2011
As Revised [Member]
Cash flows from operating activities:                                                                          
Net income $ 2,435 $ 10,710 $ 10,789 $ 21,418 $ 5,622 $ 2,341 $ 4,251 $ 10,373 $ 7,769 $ 3,181 $ 7,963 $ 10,950 $ 21,323 $ 25,574 $ 23,010 $ 563 $ (172) $ 292 $ 337 $ (185) $ (57) $ 391 $ (242) $ 95 $ 387 $ (1,019) $ 6,185 $ 2,169 $ 4,543 $ 10,710 $ 7,584 $ 3,124 $ 8,354 $ 10,708 $ 21,418 $ 25,961 $ 21,991
Net (gains) losses from investments (18) (755) 84 (898) 51 51 739 (147) (84) (59) 102 (143) (290) 449 (1,018) (149) 149 65 (608)          (608) (543) 1,417 (98) 200 804 (755) (84) (59) 102 (143) (898) (94) 399
Prepaid expenses and other current assets     3,683 3,991   1,271         4,619   3,929 6,279 (7,805)   (115)         260   62 257 (679)   1,156         4,879   3,991 6,536 (8,484)
Deferred revenue     (25,002) (23,308)   2,709         (12,955)   (23,302) 1,807 16,364   138         (651)   (6) (101) 281   2,847         (13,606)   (23,308) 1,706 16,645
Net cash provided by operating activities     32,352 42,766   35,453         37,231   43,223 53,147 55,444                   (457)         35,453         37,231   42,766 53,147 55,444
Purchases of property and equipment     2,049 4,388                 (4,845) (5,103) (39,776)                 457                       (4,388) (5,103) (39,776)
Net cash provided by (used in) investing activities     $ 43,847 $ (15,532)                 $ (15,989) $ (4,076) $ (53,036)                 $ 457                       $ (15,532) $ (4,076) $ (53,036)