Supplemental Disclosure to Cash Flows - Summary of Supplemental Non-Cash and Other Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]
Cash paid for income taxes—net	$ 386	$ 3,625	$ 1,079
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Value of Shares Issued	0	1,578	0
Non Cash Transactions:
Property and equipment purchases in accounts payable	270	279	113
Purchase of assets under capital lease obligations	$ 0	$ 0	$ 147