Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net - Summary of Intangible Assets (Detail)

v3.7.0.1
Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Cost, beginning balance $ 25,027 $ 25,027 $ 25,027
Cost, ending balance 25,027   25,027
Accumulated amortization, beginning balance (11,623) (9,696) (9,696)
Amortization expense (457) (486) (1,927)
Accumulated amortization, ending balance (12,079)   (11,623)
Net book value $ 12,947   13,404
Minimum      
Useful lives 3 years    
Maximum      
Useful lives 20 years    
Customer Relationships      
Cost, beginning balance $ 22,560 22,560 22,560
Cost, ending balance 22,560   22,560
Accumulated amortization, beginning balance (9,721) (8,062) (8,062)
Amortization expense (412)   (1,659)
Accumulated amortization, ending balance (10,133)   (9,721)
Net book value $ 12,427   $ 12,839
Customer Relationships | Minimum      
Useful lives 10 years   10 years
Customer Relationships | Maximum      
Useful lives 20 years   20 years
Other Intangible Assets      
Cost, beginning balance $ 2,467 2,467 $ 2,467
Cost, ending balance 2,467   2,467
Accumulated amortization, beginning balance (1,902) $ (1,634) (1,634)
Amortization expense (45)   (268)
Accumulated amortization, ending balance (1,947)   (1,902)
Net book value $ 520   $ 565
Other Intangible Assets | Minimum      
Useful lives 3 years   3 years
Other Intangible Assets | Maximum      
Useful lives 5 years   5 years