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Restatement of Previously Issued Consolidated Financial Statements - Cumulative Restatement Adjustments Recorded on Accumulated Earnings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2012
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings $ 95,328       $ 40,843        
As Previously Reported [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings   $ 95,038 $ 89,347 $ 76,841 65,576 $ 60,924 $ 49,701 $ 39,770  
As Previously Reported [Member] | Accumulated Earnings [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings                 $ 70,414
Other Insignificant Corrective Adjustments [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings   (13,085) (24,117) (23,591) (23,061) (21,676) (21,600) (21,166)  
Other Insignificant Corrective Adjustments [Member] | Accumulated Earnings [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings                 (17,503)
Other Insignificant Corrective Adjustments [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings   (953) (1,833) (1,660) (1,672) (3,444) (3,286) (3,420)  
Other Insignificant Corrective Adjustments [Member] | Accumulated Earnings [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings                 (3,359)
As Restated [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings   $ 81,000 $ 63,397 $ 51,590 $ 40,843 $ 35,804 $ 24,815 $ 15,184  
As Restated [Member] | Accumulated Earnings [Member]                  
Retained Earnings Adjustments [Line Items]                  
Accumulated earnings                 $ 49,552