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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 1,943 $ 1,441 $ 1,395
Additions charged to costs and expenses 524 803 419
Deductions (414) (260) (368)
Other additions or deductions (182) (41) (5)
Balance at end of period 1,871 1,943 1,441
Reserve for Credit Memos [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 428 672 644
Additions charged to costs and expenses 437 408 418
Deductions (408) (652) (390)
Other additions or deductions (2) 0 0
Balance at end of period 455 428 672
Slow-Moving and Obsolete Inventory Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 9,183 8,075 6,773
Additions charged to costs and expenses 2,477 2,244 2,672
Deductions (1,509) (701) (1,006)
Other additions or deductions 79 (435) (364)
Balance at end of period 10,230 9,183 8,075
Accrued Product Warranty [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 892 1,140 1,229
Additions charged to costs and expenses 74 (45) 443
Deductions (158) (133) (475)
Other additions or deductions (94) (70) (57)
Balance at end of period 714 892 1,140
U.S.Tax Capital Loss [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period   0 2,034
Additions charged to costs and expenses     0
Deductions     (49)
Other additions or deductions     (1,985)
Balance at end of period     0
Foreign Net Operating Loss Tax Carryforwards [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 3,614 1,420 295
Additions charged to costs and expenses 2,105 2,553 1,310
Deductions (287) (232) (115)
Other additions or deductions (223) (127) (70)
Balance at end of period $ 5,209 $ 3,614 $ 1,420